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Crystal Clear does not work well if there is (too) much movement in the water, preventing binding. Too many dissolved substances in the water can also interfere with the effect. Partial water changes are a good remedy for this. For example, change 25% of the water and repeat this every 2 to 3 days (3x in total).
Against green water (floating algae), Crystal Clear is a short-term solution. The remedy binds the algae (flakes) and the water becomes clear again. However, you do not remove the cause and new algae can form again in a short time.
If your pond water is green, then there is a very good chance you are suffering from algae. First, determine what kind of algae is in the pond. If there are green particles floating in the water, then you are suffering from floating algae. A short-term solution is to use Velda Crystal Clear. Crystal Clear is an environmentally friendly product, which precipitates dirt and algae particles on the bottom and makes the water clear. The long-term solution to this problem involves a number of measures. If not already present, apply a layer of substrate. Simultaneously add Bacterial (nitrifying bacteria cultures). Apply more pond plants. Good species at this stage are floating plants, such as water gentian, frog beetle, Azolla, duckweed or water lilies. Make sure the combined water hardness (GH value) is sufficiently high. It should be at least 8 °DH. At lower values use Velda GH-Plus to raise it again. When these measures are applied, over time the environment will stabilize and the floating algae will disappear. After the water has become clear, oxygen plants can be added. Good species are waterweed, hornwort and pondweed. Another excellent way to improve the environment and thus clear the water is to install the Cross-Flow Biofill. When using this, Velda guarantees a clear pond within three months
Crystal Clear is a solution for green water (floating algae). Alglets is a solution for string and slime algae. However, you then do not remove the cause and new algae will form again in a while.
For permanent control of green water, a UV-C Filter very suitable.
Green water means there is floating algae in the pond. You may have a filter and UV-C lamp that cannot handle the amount of water. Keep approximately the following: an 18 watt UV-C filter is recommended to keep a pond up to 9000 liters clear. Tip: If you also have fish in the pond; never overfeed. Make sure the fish eat the scattered food within a few minutes. This is because food that is not eaten is a food source for algae.
