S-100 filter is tested by NSF International which has the highest standards. Also, S-100 is the first product to pass the NFS's Live Cyst Test. Generally accepted and world wide known provider of independent test certificates NSF, certified that products purify the water both esthetically and health wise. And these products have all the related standards.

*** Decorative Pool Systems ****

You definetely need a biological filtration to make your pool or pond water in the garden clean and clear. Biological filters make physical cleaning of water (keep the impurities in water) and make its biological purification ( denitrification process), prevent algea's growth.