A sign of protein in the water, which is how marine tank protein skimmers work. Can come from things such as your frog spawn or fish spawning in the pond and other organic compounds. If you raised your water level, it would overflow out of the pond.
Hello The pond is 25000 litres with 3 filters. One of the filters is high which allows water to run down a waterfall. Where the water runs into the pond a white foam can be seen. This has never happened before and I cannot find out what is causing it. The weather here is very hot and has been...
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