{"title":"KH plus","description":"\u003ch2\u003e What is the KH value?\u003c\/h2\u003e\n\n\u003cp\u003e KH stands for carbonate hardness. It indicates the amount of carbonic acid (CO₂)-binding carbonates and bicarbonates present in the pond water. These substances form the water's buffering capacity, preventing acidification and keeping the pH stable. If the KH value is too low, the pH can fluctuate significantly—which poses a risk to fish, plants, and the biological balance.\u003cbr\u003e\u003c\/p\u003e\n\n\u003ch2\u003e Why use KH Plus?\u003c\/h2\u003e\n\n\u003cp\u003e When the KH value falls below the recommended limit (e.g., below approximately 4–6 °dH), the pond water is vulnerable to acidification. By adding KH Plus, you can increase the KH in a controlled manner. A correct KH value supports oxygen-producing plants, prevents pH crashes, and ensures a stable ecosystem.\u003cbr\u003e\u003c\/p\u003e\n\n\u003ch2\u003e Who is KH Plus suitable for?\u003c\/h2\u003e\n\n \u003cp\u003eKH Plus is suitable for all types of ponds—from small ornamental ponds to larger koi ponds or swimming ponds—where the KH value is low or the risk of acidification is high. It is an essential product for pond enthusiasts who want to maintain a clear water environment and healthy plants.\u003c\/p\u003e\n\n\u003ch2\u003e Usage \u0026amp; tips\u003c\/h2\u003e\n\n\u003cp\u003e First, measure the KH value of the pond water with a reliable \u003ca href=\"\/en\/collections\/vijverwater-testen\" title=\"pond water testing\"\u003etest kit\u003c\/a\u003e . If you determine that the KH is too low, add KH Plus according to the dosage on the package. Ideally, administer in low light and spread the solution evenly over the water surface. Check the KH value again after 24-48 hours to see if the increase has been achieved. Be careful not to overcorrect: a too high KH is less often a problem, but a sudden large increase or adding multiple products simultaneously (such as \u003ca href=\"\/en\/collections\/gh-plus\" title=\"gh-plus\"\u003eGH Plus\u003c\/a\u003e ) can lead to unforeseen chemical reactions.\u003cbr\u003e\u003c\/p\u003e\n\n \u003ch2\u003eKey benefits at a glance\u003c\/h2\u003e\n\n\u003cp\u003e Increases the carbonate hardness of the water, preventing pH fluctuations. Supports the growth of oxygen-producing plants and stabilizes the pond environment. Easy-to-use product—measure → dose → check. Ideal for ponds where water changes, rainwater, or other factors have lowered the KH value. With the correct application of KH Plus, you lay the foundation for a healthy, stable, and clear pond. Visit the category page for the full range and the correct size for your pond.\u003c\/p\u003e","products":[{"product_id":"velda-kh-plus-500ml","title":"Velda KH plus 500ml","description":"Velda kh plus 500ml.\u003cbr\u003e\u003cp\u003e \u003cspan\u003eIncreases the carbonate hardness (KH value) of the pond water. This KH value, like the GH value, is expressed in German Hardness Degrees (DH). A sufficiently high value (4 to 8°DH) counteracts acidification in the pond environment and, through the bound CO2, ensures healthy development of oxygen-producing plants.\u003c\/span\u003e\u003c\/p\u003e \u003cp\u003eThe KH value of water indicates the amount of carbon dioxide-bound calcium and magnesium. The KH value is also called the acid-binding capacity of water. Oxygen-producing plants, in particular, require a KH value of at least 4°DH for good growth. At a value below 4°DH, the acid-binding capacity is low, which can cause the pH value to drop and acidification to occur.\u003c\/p\u003e\n\u003cp\u003e The ideal KH value for ornamental ponds is between 4 and 8°DH. With Velda's KH Plus, this important KH value can be easily increased.\u003c\/p\u003e\n\u003ch3\u003e \u003cspan\u003eBenefits of Velda KH plus 500ml:\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli\u003e Increases the carbonate hardness value of the pond\u003c\/li\u003e\n\n\u003cli\u003e Easy to apply\u003c\/li\u003e\n\n\u003cli\u003e increases the Carbonate hardness by 3°DH\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch3\u003e Included in the delivery:\u003c\/h3\u003e\n\u003cul\u003e\u003cli\u003e Velda KH plus 500ml\u003c\/li\u003e\u003c\/ul\u003e","brand":"Velda","offers":[{"title":"Default Title","offer_id":47112587018527,"sku":"122032","price":9.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0808\/0323\/4079\/products\/velda-kh-plus-5000ml.jpg?v=1698398835"},{"product_id":"velda-kh-plus-1000ml","title":"Velda KH plus 1000ml","description":"Velda kh plus 1000ml.\u003cbr\u003e \u003cp\u003e\u003cspan\u003eIncreases the carbonate hardness (KH value) of the pond water. This KH value, like the GH value, is expressed in German Hardness Degrees (DH). A sufficiently high value (4 to 8°DH) counteracts acidification in the pond environment and, through the bound CO2, ensures healthy development of oxygen-producing plants.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e The KH value of water indicates the amount of carbon dioxide-bound calcium and magnesium. The KH value is also called the acid-binding capacity of water. Oxygen-producing plants, in particular, require a KH value of at least 4°DH for good growth. At a value below 4°DH, the acid-binding capacity is low, which can cause the pH value to drop and acidification to occur.\u003c\/p\u003e\n\u003cp\u003e The ideal KH value for ornamental ponds is between 4 and 8°DH. With Velda's KH Plus, this important KH value can be easily increased.\u003c\/p\u003e\n\u003ch3\u003e \u003cspan\u003eBenefits of Velda KH plus 1000ml:\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli\u003e Increases the carbonate hardness value of the pond\u003c\/li\u003e\n\n\u003cli\u003e Easy to apply\u003c\/li\u003e\n\n\u003cli\u003e increases the Carbonate hardness by 3°DH\u003c\/li\u003e\n\n\n\u003c\/ul\u003e \u003ch3\u003eIncluded in the delivery:\u003c\/h3\u003e\n\u003cul\u003e\u003cli\u003e Velda KH plus 1000ml\u003c\/li\u003e\u003c\/ul\u003e","brand":"Velda","offers":[{"title":"Default Title","offer_id":47112587116831,"sku":"122033","price":15.3,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0808\/0323\/4079\/products\/velda-kh-plus-1000-ml.jpg?v=1698398841"},{"product_id":"duo-gh-kh-plus","title":"Velda Duo GH\/KH plus","description":"Velda Duo GH\/KH plus\u003cbr\u003e \u003cp\u003eDuo GH\/KH Plus increases the GH and KH values ​​of pond water by adding minerals. This results in a stable pond environment and promotes the growth of aquatic plants. If the water hardness is too low, it can slow plant growth and cause water acidification. To prevent this, it is important to regularly check the water parameters and adjust them accordingly. Ideally, a GH value between 8° and 12°DH and a KH value between 6° and 8°DH is ideal. This ensures that microorganisms and oxygen-producing plants, such as waterweed, hornwort, and pondweed, can develop well.\u003c\/p\u003e\n\u003cp\u003e The GH value, expressed in German degrees of hardness, indicates the total hardness of the water and is formed by calcium and magnesium sulfates. The KH value, also expressed in German degrees of hardness, indicates the carbonate hardness of the water and is also called the acid-binding capacity. Carbonate is formed by the binding of free carbon dioxide (CO2) to calcium and magnesium.\u003c\/p\u003e \u003cp\u003eOne 1000 ml package is sufficient to treat 10,000 litres of pond water.\u003c\/p\u003e\n\u003ch3\u003e \u003cspan\u003eBenefits of Velda Duo GH\/KH plus:\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli\u003e Easy to apply\u003c\/li\u003e\n\n\u003cli\u003e Works very fast and effectively\u003c\/li\u003e\n\n\u003cli\u003e \u003cspan\u003ePackaging suitable for ponds up to 10,000 litres\u003c\/span\u003e\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch3\u003e Included in the delivery:\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli\u003e Instructions for use\u003c\/li\u003e\n\n\u003cli\u003e Velda Duo GH\/KH plus\u003c\/li\u003e\n\n\n\u003c\/ul\u003e","brand":"Velda","offers":[{"title":"Default Title","offer_id":47112647115039,"sku":"142060","price":18.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0808\/0323\/4079\/products\/velda-duo-gh-kh-plus.jpg?v=1698399258"},{"product_id":"secret-kh-plus-37500-liter","title":"Secret KH plus 37,500 liters","description":"\u003cstrong\u003eSecret KH plus 37,500 liters\u003cbr\u003e\u003c\/strong\u003e\n \u003cp\u003eYour KH value, also known as \"Carbonate Hardness,\" consists of the amount of carbonates and bicarbonates in the water. These components ensure that the pH value (acidity) remains sufficiently high. When waste products are converted in the filter, hydrogen (H+) is released. Hydrogen is an acid and can cause the pH to drop to dangerous levels.\u003c\/p\u003e\n\n\u003cp\u003e The KH prevents this drop in acidity. The bicarbonates neutralize the released hydrogen. However, these (bi)carbonates are lost in the process. The KH in a pond will therefore decrease as a result of the breakdown of waste products. When the KH falls below 2 degrees German Hardness, the pH will begin to fluctuate. If the KH is completely depleted, the released hydrogen will directly affect the pH. This can happen so quickly that the pH drops to a lethal level of below pH 5 within a few hours. Most pond fish will not survive this.\u003c\/p\u003e\n\n \u003cp\u003eIt is therefore crucial that you measure your KH and ensure it never falls more than 1 degree below the KH level of your tap water. This can be done with sodium bicarbonate or KH+. Keep in mind that if your tap water has a low KH, you will need to add more KH during water changes to maintain the correct level. We also recommend a KH level between 5 and 10.\u003c\/p\u003e\n\n\u003cp\u003e \u003cstrong\u003eDosage:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e Secret's KH+ quickly and effectively increases the KH value of pond water and stabilizes the pH value.\u003c\/p\u003e\n\n\u003cp\u003e Due to the influence of sunlight, plants, and the presence of algae, the pH value in water with a low KH can fluctuate over the course of the day. To prevent this, we recommend a KH value between 5 and 10 KH.\u003cbr\u003e\u003cbr\u003e 1 kilo of Secret's KH Plus is sufficient to increase the total hardness of 37,500 litres of pond water by 1 point.\u003c\/p\u003e\n\n\u003cp\u003e \u003cem\u003eDo not use simultaneously with medication or GH+\u003c\/em\u003e\u003c\/p\u003e","brand":"Takazumi","offers":[{"title":"Default Title","offer_id":47113130869023,"sku":"WB10030","price":19.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0808\/0323\/4079\/files\/secret-kh-plus-1kg.jpg?v=1775630464"},{"product_id":"secret-kh-plus-75000-liter","title":"Secret KH plus 75,000 liters","description":"\u003cstrong\u003eSecret KH plus 75,000 liters\u003cbr\u003e\u003c\/strong\u003e\n\u003cp\u003e Your KH value, also known as carbonate hardness, consists of the amount of carbonates and bicarbonates in the water. These components ensure that the pH value (acidity) remains sufficiently high. When waste products are converted in the filter, hydrogen (H+) is released. Hydrogen is an acid and can cause the pH to drop to dangerous levels.\u003c\/p\u003e\n\n \u003cp\u003eThe KH prevents this drop in acidity. The bicarbonates neutralize the released hydrogen. However, these (bi)carbonates are lost in the process. The KH in a pond will therefore decrease as a result of the breakdown of waste products. When the KH falls below 2 degrees German Hardness, the pH will begin to fluctuate. If the KH is completely depleted, the released hydrogen will directly affect the pH. This can happen so quickly that the pH drops to a lethal level of below pH 5 within a few hours. Most pond fish will not survive this.\u003c\/p\u003e\n\n\u003cp\u003e It is therefore crucial that you measure your KH and ensure it never falls more than 1 degree below the KH level of your tap water. This can be done with sodium bicarbonate or KH+. Keep in mind that if your tap water has a low KH, you will need to add more KH during water changes to maintain the correct level. We also recommend a KH level between 5 and 10.\u003c\/p\u003e\n\n\u003cp\u003e \u003cstrong\u003eDosage:\u003c\/strong\u003e\u003c\/p\u003e\n\n \u003cp\u003eSecret's KH+ quickly and effectively increases the KH value of pond water and stabilizes the pH value.\u003c\/p\u003e\n\n\u003cp\u003e Due to the influence of sunlight, plants, and the presence of algae, the pH value in water with a low KH can fluctuate over the course of the day. To prevent this, we recommend a KH value between 5 and 10 KH.\u003cbr\u003e\u003cbr\u003e 2 kilos of Secret's KH Plus is sufficient to increase the total hardness of 75,000 litres of pond water by 1 point.\u003c\/p\u003e\n\n\u003cp\u003e \u003cem\u003eDo not use simultaneously with medication or GH+\u003c\/em\u003e\u003c\/p\u003e","brand":"Takazumi","offers":[{"title":"Default Title","offer_id":47113131065631,"sku":"WB10031","price":32.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0808\/0323\/4079\/products\/kh_groot_2.jpg?v=1698402454"},{"product_id":"secret-kh-plus-150000-liter","title":"Secret KH plus 150,000 liters","description":"\u003cstrong\u003eSecret KH plus 150,000 liters\u003cbr\u003e\u003c\/strong\u003e\n \u003cp\u003eYour KH value, also known as carbonate hardness, consists of the amount of carbonates and bicarbonates in the water. These components ensure that the pH value (acidity) remains sufficiently high. During the conversion of waste products in the filter, hydrogen (H+) is released. Hydrogen is an acid and can cause the pH to drop to dangerous levels.\u003c\/p\u003e\n\n\u003cp\u003e The KH prevents this drop in acidity. The bicarbonates neutralize the released hydrogen. However, these (bi)carbonates are lost in the process. The KH in a pond will therefore decrease as a result of the breakdown of waste products. When the KH falls below 2 degrees German Hardness, the pH will begin to fluctuate. If the KH is completely depleted, the released hydrogen will directly affect the pH. This can happen so quickly that the pH drops to a lethal level of below pH 5 within a few hours. Most pond fish will not survive this.\u003c\/p\u003e\n\n \u003cp\u003eIt is therefore crucial that you measure your KH and ensure it never falls more than 1 degree below the KH level of your tap water. This can be done with sodium bicarbonate or KH+. Keep in mind that if your tap water has a low KH, you will need to add more KH during water changes to maintain the correct level. We also recommend a KH level between 5 and 10.\u003c\/p\u003e\n\n\u003cp\u003e \u003cstrong\u003eDosage:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e Secret's KH+ quickly and effectively increases the KH value of pond water and stabilizes the pH value.\u003c\/p\u003e\n\n\u003cp\u003e 4 kilos of Secret's KH Plus is sufficient to increase the total hardness of 150,000 litres of pond water by 1 point.\u003c\/p\u003e\n\n\u003cp\u003e \u003cem\u003eDo not use in conjunction with medication or GH+\u003c\/em\u003e\u003c\/p\u003e","brand":"Takazumi","offers":[{"title":"Default Title","offer_id":47113131163935,"sku":"WB10032","price":39.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0808\/0323\/4079\/files\/kh-plus-150000-liter-4kg.jpg?v=1777365408"},{"product_id":"secret-kh-plus-375-000-liter","title":"Secret KH plus 375,000 liters","description":"\u003ch2\u003e \u003cstrong\u003eSecret KH plus 375,000 liters\u003cbr\u003e\u003c\/strong\u003e\n\u003c\/h2\u003e\n\n\u003cp\u003e Your KH value, also known as carbonate hardness, consists of the amount of carbonates and bicarbonates in the water. These components ensure that the pH value (acidity) remains sufficiently high. During the conversion of waste products in the filter, hydrogen (H+) is released. Hydrogen is an acid and can cause the pH to drop to dangerous levels.\u003c\/p\u003e\n\n \u003cp\u003eThe KH prevents this drop in acidity. The bicarbonates neutralize the released hydrogen. However, these (bi)carbonates are lost in the process. The KH in a pond will therefore decrease as a result of the breakdown of waste products. When the KH falls below 2 degrees German Hardness, the pH will begin to fluctuate. If the KH is completely depleted, the released hydrogen will directly affect the pH. This can happen so quickly that the pH drops to a lethal level of below pH 5 within a few hours. Most pond fish will not survive this.\u003c\/p\u003e\n\n\u003cp\u003e It is therefore crucial that you measure your KH and ensure it never falls more than 1 degree below the KH level of your tap water. This can be done with sodium bicarbonate or KH+. Keep in mind that if your tap water has a low KH, you will need to add more KH during water changes to maintain the correct level. We also recommend a KH level between 5 and 10.\u003c\/p\u003e\n\n\u003cp\u003e \u003cstrong\u003eDosage:\u003c\/strong\u003e\u003c\/p\u003e\n\n \u003cp\u003eSecret's KH+ quickly and effectively increases the KH value of pond water and stabilizes the pH value.\u003c\/p\u003e\n\n\u003cp\u003e 10 kilos of Secret's KH Plus is sufficient to increase the total hardness of 375,000 litres of pond water by 1 point.\u003c\/p\u003e\n\n\u003cp\u003e \u003cem\u003eDo not use in conjunction with medication or GH+\u003c\/em\u003e\u003c\/p\u003e","brand":"Takazumi","offers":[{"title":"Default Title","offer_id":47948439257375,"sku":"SC10005","price":89.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0808\/0323\/4079\/files\/secret-kh-plus-10kg.jpg?v=1711024661"},{"product_id":"secret-kh-plus-562-500-liter","title":"Secret KH plus 562,500 liters","description":"\u003ch2\u003e \u003cstrong\u003eSecret KH plus 562,500 liters\u003cbr\u003e\u003c\/strong\u003e\n\u003c\/h2\u003e\n\n\u003cp\u003e Your KH value, also known as carbonate hardness, consists of the amount of carbonates and bicarbonates in the water. These components ensure that the pH value (acidity) remains sufficiently high. During the conversion of waste products in the filter, hydrogen (H+) is released. Hydrogen is an acid and can cause the pH to drop to dangerous levels.\u003c\/p\u003e\n\n \u003cp\u003eThe KH prevents this drop in acidity. The bicarbonates neutralize the released hydrogen. However, these (bi)carbonates are lost in the process. The KH in a pond will therefore decrease as a result of the breakdown of waste products. When the KH falls below 2 degrees German Hardness, the pH will begin to fluctuate. If the KH is completely depleted, the released hydrogen will directly affect the pH. This can happen so quickly that the pH drops to a lethal level of below pH 5 within a few hours. Most pond fish will not survive this.\u003c\/p\u003e\n\n\u003cp\u003e It is therefore crucial that you measure your KH and ensure it never falls more than 1 degree below the KH level of your tap water. This can be done with sodium bicarbonate or KH+. Keep in mind that if your tap water has a low KH, you will need to add more KH during water changes to maintain the correct level. We also recommend a KH level between 5 and 10.\u003c\/p\u003e\n\n\u003cp\u003e \u003cstrong\u003eDosage:\u003c\/strong\u003e\u003c\/p\u003e\n\n \u003cp\u003eSecret's KH+ quickly and effectively increases the KH value of pond water and stabilizes the pH value.\u003c\/p\u003e\n\n\u003cp\u003e 15 kilos of Secret's KH Plus is enough to increase the total hardness of 562,500 litres of pond water by 1 point.\u003cbr\u003e\u003cbr\u003e \u003cem\u003eOr increase a pond with a capacity of 100,000 by 5.5 points\u003c\/em\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003cem\u003eDo not use in conjunction with medication or GH+\u003c\/em\u003e\u003c\/p\u003e","brand":"Takazumi","offers":[{"title":"Default Title","offer_id":47948452004127,"sku":"SC10006","price":129.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0808\/0323\/4079\/files\/secret-kh-plus-15kg.jpg?v=1711024681"}],"url":"https:\/\/vijverlevenhub.com\/en\/collections\/kh-plus.oembed","provider":"Vijverleven","version":"1.0","type":"link"}