Natural Swimming Pool/Ponds (NSP's) are a chemical-free, low-maintenance alternative to traditional chlorine pools. The water is clean, crystal-clear, and filtered naturally using a built-in biological filter.
During the summer, algae growth can be a huge problem in garden ponds. The great news is that there is an easy way to keep pond water clear without using expensive chemicals. Here's how. | GetBusyGardening.com