pH 7.8, TA 8 - creeping in opposite directions
Hi Ben or Janet or one of the other wizards,
This morning's numbers from my Taylor K-2006 are:
TC: 12, CC: .5, pH: 7.8, TA: 8, CYA: 100++ (dot dissappears when tube is 1/3 full)
Over last 4 weeks, pH has gradually increased and TA has gradually decreased. Both have been in ideal the ideal range since opening the pool in mid-May, but are now creeping to the maximum pH and minimum TA levels. We've had 3 or 4 inches of rain over the past two weeks and that usually lowers the pH, but not this time.
The acid demand test for my IG, VL, 25K gallon pool calls for about 3 lbs of dry muriatic acid to bring pH down to 7.5.
The water is crystal clear and has been all season. I switched to using 12.5% bleach exclusively since June 2011 thanks to this forum! I keep the FC between 8ppm and 15ppm due to high CYA. (The water and vinyl liner are both about 15 years old. We know it is time to replace both, but we are trying to eek out a couple more years since all funds are going to tuition payments.)
Questions:
1) Since both pH and TA are at the borderline levels, should I try to adjust them now or monitor them and act when/if the pH increases and/or the TA decreases?
2) If I adjust now, should I first treat the high pH or the low TA?
3) Since pH and TA are moving in opposite directions, will adjusting one cause the other to get worse?
4) For adjusting the pH, I have about 1/3 gallon of 31% liquid muriactic acid. The table in the Taylor booklet says I need 3 lbs of dry MA. Can I convert this to determine how much liquid MA to add?
Thank you again for rescuing me last season!
Taylor K-2006, IG Vinyl 26,000g, Sand filter 275 lbs, 3/4 HP Hayward Super Pump II, CYA over 100, Using 12.5% bleach
18'x36' rectangle 26K gal IG pool; Liquid Chlorine 12.5% ; Sand Filter 275 lbs. sand filter; Hayward Super Pump II 3/4 HP pump; 23 hrshrs; Taylor K-2006; delivered via truck; summer: ; winter: ; iPad; PF:4.6
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