This instructable is for keeps our swimming pool water safe and clean, chlorine eliminates most dangerous contaminants. You need only a plastic bottle, chlorine tablets and some tool for make several holes in bottle body.
Hidden costs of having a Salt Chlorination System?
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. by kathrine