When it comes to Alternative Sanitizers, here at Paradise Pool Supplies we carry a number of different brands one of which is the well known, HAYWARD. Under this brand we have the HAYWARD SWIMPURE N2CN25 WATER PURIFIER cartridge filter inserts and the HAYWARD SWIMPURE N2CN35 WATER PURIFIER cartridge filter inserts. Each one gives you the opportunity to experience a revolutionary new approach to sanitizing your pool that will give you the clearest water imaginable!