Recent content by Jo Jesty

Ah... Final and perfect clarity, especially your "that's how the industry defined it." Thank you so much. In roaming around I similarly found that dichlor (which I mentioned is actually 28% chlorine) is stated by "the industry" as being 56% "available chlorine": see the Assoc of Spa & Pool...

Goodness, that was a quick response: thank you again TFP Expert (after my original problems, last year, solved with your advice). HOWEVER, I don't find your explanation works at the level of the simple molecular formula and the atomic weights (AW): NaOCl has only one Cl atom, not two, and the...

I think there's a lot of misleading info about chlorine concentrations, particularly about sodium hypochlorite--i.e. bleach, or shock. Please correct me if I'm wrong. Clorox bleach is about 8.5% and pool shock is 12.5%, but that's hypochlorite, and chlorine is only 47% of sodium hypochlorite by...

Hope this might be useful from an amateur... CYA might drop very slowly. After my last year's 2/3 draining and getting it down to 50, it's now about 40, probably mostly from backwashing and winterizing. However, using just hypochlorite all the time (12.5%, aka liquid shock), the CYA (measured...

All turned out well, thanks to the excellent advice. By Taylor's kit, CYA was about 130! Pumping out about 15K gal, I got it down to about 40 (reading that black dot depends a lot on lighting!). I pumped down to about 1 ft, like TimerGuy, and added gently into the shallow end from the hose. Now...

Thank you SO much. I will follow up when I've gone thru the partial draining and shock etc. BTW, with regular brushing (green matter on the floor sucked down the drain into the filter) and vacuuming (old little Arneson, super gadget), the pool is just slightly cloudy, perfectly swimmable. But...

What an excellent site! It's been obvious to me for a while that my CYA is way too high, through using dichlor for ages. Only through reading this site did I find that out. I just ordered a kit with a CYA test, but already I'm sure: adding yet more dichlor or even hypo barely registers chlorine...