waste,

Doesn't it make sense to try the 60 to 80 CYA range and see how it works with a SWG? If the manufacturers, etc. have determined that the super chlorination of the water as it passes through the cell helps reduce the need for active chlorine (not tied up by CYA) in the pool than why not give it a whirl? The important thing is to keep algae and other nasties at bay so if people are running their SWGs sucessfully in the 60-80 range and not reporting any problems than there must be something to it.

If we run with a CYA under 60 than the cell would need to work harder to sustain a given residual chlorine level, which should shorten the cell life. So it's not a matter of the manufacurers trying to sell us more replacement cells.

I just installed a SWG so I'll see how it goes while follwing the manuf. suggestions. Otherwise, I might be shortening the cell life unnecessarily.