I am new at this but learning quickly. Can't believe how CYA effects Chlorine and how little pool stores talk about it. Guess they wouldn't be in business if they did.
I bought the wrong test kit from leslies and am hoping to use it for now and then buy the more expensive one when I use up these chemicals. I bought the dpd kit, but not the fas-dpd. It also doesn't test CYA. So, I am going to make those pool stores that robbed me help me with testing until I finish off this kit, However, had a rude awakening with a store last night. Tell me if I am right or wrong:
I tested: FC: 5, PH 7.5, Alkalinity is about 100. I had added borax 12 hours earlier and it showed an increase in ph from 7.2 to 7.5. Felt good, but once I started learning what CYA does, well, I still had pucks in my chlorinator. I turned the chlorinator to 0 to keep more cya from entering. We get hot sun and lots of rain here in South Alabama. Plenty scheduled for the next 2 days and last night. That's why I increased the PH to keep it from dropping to low after rain. Or, at least that was my understanding. Doesn't rain contain Acid? Doesn't it lower PH?
Pool store numbers:
CYA: 67 ppm
They said everything was fine, just add 4lbs of shock and wait for the rain. The guy said the rain would increase the PH?! Reading the computer instructions: Add 1lb 3oz of Soda, Add Calcium Chloride, add Chlorine shock, add 2 tablets trichlor.
Wow! He ignored everything the computer said except for the shock.
Needless to say, I won't do any of it! I only wanted the CYA numbers and to verify what I am seeing on my own tests. I also have another cheaper test kit and strips. They agreed with my test results above.
The rain last night pushed some silt into the pool, so I am going to vacuum to waste and add some water and then re-test shortly. My pool is clear and looks great. The Chlorine is high because I added too much bleach the other day. My results were showing 0ppm on the FC and so I added 2 gallons of 5.25. My chlorine shot up, but I was losing chlorine daily, now it is stabilizing and not losing. Because of daily rains there is a need to backwash weekly at a minimum with a small water replacement ongoing. I am going to have to learn in this weather how to maintain FC and get the CYA down. Am I correct that the CYA should gradually reduce with these backwashes and water replacements without a large drain since the CYA is 67ppm? I still have a hard time believing that their ph recorded that low.
What a waste of money on these pool stores! I have ordered a CYA test kit from TFTestkits and it has already shipped. Just got concerned that I was already too high and might have to drain. Glad to see it not super high. I have a supply of bleach, borax and B soda. I will test daily and go to a different pool store weekly to verify results. Can't wait to get a better test kit!
Any advice suggestions would be greatly appreciated!