Quote Originally Posted by Tredge
My pool is Still at 340 Alk and I havent bothered to lower it.
Water is 'crystal' clear and no scaling problems.
My CA hardness is quite low...almost 0.
PH stabalizes at ~7.8 but I try to knock it down to 7.4 every few days.
My TDS is quite high due to the SWG. At around 3000 TDS currently.
For what it's worth, the pH stabilization at 7.8 is "predicted" by my spreadsheet and the CO2 graph except that on the graph I made it's off the chart (looks like I need to make a new graph for you high alkalinity folks ). As for your calcium hardness, you really don't want it to get to 0 if you have a plaster/grout pool. The problem with near 0 calcium isn't scaling, but corrosion (not of metal, but of plaster/grout). Is your pool vinyl? Is your CYA near 80 since you have an SWG? Mostly I'm asking just to get a sense of everyone's pool so I can see where the models start to break down.

Richard