I am new to pools. I have this device. If I have a hayward s244T sand filter why do I need a Nature2 mineral sanitizer? If I am testing and making sure the chemicals are fine is this necessary?
http://www.poolzoom.com/nature-2-g-...r6=pla&cr7=c&gclid=CJDOidWZ2MUCFQYxaQodqmEAmA
http://www.poolzoom.com/nature-2-g-...r6=pla&cr7=c&gclid=CJDOidWZ2MUCFQYxaQodqmEAmA