The rule of thumb is that if the alloy is
1 x WPC50FF20 Watts pleated 50 Micron "Made in the USA
Also recommended as a pre filter before carbon filters with a small micron size
Filters that remove chlorine and harmful chemicals rom the water
Colour indicates the amount of boron present in ppm from 0 to 100
Rydlyme 2 ltr bottle descaler Watts The rule of thumb isRYDLYME Marine is a non hazardous, non corrosive, non injurious, non toxic, yet fully biodegradable marine descaler, heavily fortified with wetting and penetrating agents which actually dissolves water scale, rust, mussels, barnacles, zebra mussels, tiger shells and other water formed deposits from water operated marine equipment. RYDLYME Marine should be used as directed and at any temperature within the operating limits between 0F 18C and 180F 82C.