It would help your chlorine to work a bit better to drop the PH down to 7.4 or even 7.2. This will be harder to do with the higher alk as it will resist lowering the pH but might be worth it.
Re: alk what is a good number
It would help your chlorine to work a bit better to drop the PH down to 7.4 or even 7.2. This will be harder to do with the higher alk as it will resist lowering the pH but might be worth it.
Mark
Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater
Re: alk what is a good number
Mark is correct about lower pH being more effective for chlorine, but in the presence of CYA the influence on chlorine effectiveness vs. pH is significantly reduced. These graphs show how a change from a pH of 7.8 to a pH of 7.2 improves chlorine effectiveness by less than 30% so increasing FC by 30% would do the same thing. If there were no CYA present, then the same 7.8 to 7.2 pH change would improve chlorine's effectiveness by over 110% (more than double).
Richard
Posting Permissions
Reply With Quote
Bookmarks