First time post here looking to gain some assistance. We have an Intex above ground pool, 22 feet by 52 inches deep, roughly 10500 gallons of water with a salt water system. We purchased this unit last year and did well most of our swimming season here in Southern Iowa.
Got it up earlier this year than last, kids got in before Memorial Day this year, and it has been quite hot here the last 3 weeks (in the 90's almost everyday). We were gone for about 4 days and in that time our chemicals started getting out of whack. I have a TF-100 test kit, bought at the recommendations of this site last year, and have been doing well with frequent checks and getting fairly solid results. However, when I checked them tonight here is what we currently have for numbers:
ph 7.2 (had been right at 7.5)
chlorine went from right round 2/4 ppm to non existent tonight
calcium is running around 175 ppm
alkalinity has maintained a level of 40
CYA took a dive to 30 from 50
salt level dropped to 2800 from 3200
I don't want to over react with things and create any new issues, but certainly want to stay on top of things to make sure we don't have anything major start to take over our pool either. My son thinks it appeared like that there might have been some staining on the sides of our pool tonight, but my eyesight didn't detect that, although admittedly his eyesight is better than mine.
Thoughts and suggestions would be greatly appreciated.