What exactly is free chlorine? Is that what's in the SHOCK or the tablets that my floating duck holds? Any help is appreciated.

I am operating an Olympic sized swimming pool at a recreation facility. The pool is not open currently due to pump problems. 2 out of 3 of our sand filters have burned...

I have a brown spot on my fiberglass pool where a chlorine tablet lay for a day I have tried lots of absorbic acid and oxalic acid nothing will remove it does anyone...

reguardless how much chlorine shock we put in our pool we can't get a free chlorine reading, even though total chlorine does read between 3 and 7.

I purchased a bucket of pucks in late August but never ending up needing them, so the bucket is still sealed. Can these be kept until next year & used. If so can...

I don't know the difference between, free chlorine and stablizer. My dip stick reads free chlorine is too high and stablizer is too low. What does this mean and how do I...

I recently bought a small 1000 gallon inflatable pool for the kids to play in. The pool shop up the street told me to shock the pool with one pound. I accidently put one...