Hi there...
Background:
Second full summer since inground pool installation. Plaster - Ozone and UV on the system so we generally keep chlorine at about 1ppm with no issues. City water. Automatic Cover so pool is always covered unless we are actively swimming. Approx 19,000 gallons. Albuquerque NM so daytime temps in the 90s and nights in the 60s
Last summer we had no issues with keeping chlorine levels up. We used tabs last year. When we opened our pool this spring Leslie's testing said the CyA was getting high so we switched to 73% Cal-Hypo powder. No issues at all the first month or two. Now - we can't keep chlorine in the water; Tried switching to liquid chlorine - no change - can't keep it up for more than a day. For example - we did a phosphate treatment Tue - Thur of last week. Had pool party on Thur - shocked Thur night. Pump ran overnight. FAC on Friday morning was greater than 5ppm. FAC on Saturday morning was as shown in chart below - less than 1ppm. That was the second time in a month that has happened - gone from 5+ the day after shocking to less than 1 the next day. Been testing with the Taylor 2006 at a local store - the Taylor 1004 at home - also testing at Leslie's for a second "opinion" - the number are varying DRAMATICALLY... I am VERY leery of Leslie's for a variety of reasons - but I wonder if their automatic system is more accurate than "looking at the colors"... See below for side by side results...

We are planning to do several back to back phosphate treatments in hopes of getting the #s down - that first phosphate treatment/filter cleaning didn't seem to do anything.
Not sure if we should go back to tablets or not - Leslie's says CyA is too high - Other store says it is fine. I just don't know whose numbers to trust. I know a lot of people get the 2006 and test themselves - but ??? It would still potentially show the same discrepancy as the "professional" using the 2006 at the store. I am confused... The guy from the pool company (salty older guy who has been doing pools for 40+ years) who built it said the phosphates aren't a big deal but ??? From what I understand - it isn't an issue until you get an algae bloom and then it is a big problem - so I want to figure it out.
Background:
Second full summer since inground pool installation. Plaster - Ozone and UV on the system so we generally keep chlorine at about 1ppm with no issues. City water. Automatic Cover so pool is always covered unless we are actively swimming. Approx 19,000 gallons. Albuquerque NM so daytime temps in the 90s and nights in the 60s
Last summer we had no issues with keeping chlorine levels up. We used tabs last year. When we opened our pool this spring Leslie's testing said the CyA was getting high so we switched to 73% Cal-Hypo powder. No issues at all the first month or two. Now - we can't keep chlorine in the water; Tried switching to liquid chlorine - no change - can't keep it up for more than a day. For example - we did a phosphate treatment Tue - Thur of last week. Had pool party on Thur - shocked Thur night. Pump ran overnight. FAC on Friday morning was greater than 5ppm. FAC on Saturday morning was as shown in chart below - less than 1ppm. That was the second time in a month that has happened - gone from 5+ the day after shocking to less than 1 the next day. Been testing with the Taylor 2006 at a local store - the Taylor 1004 at home - also testing at Leslie's for a second "opinion" - the number are varying DRAMATICALLY... I am VERY leery of Leslie's for a variety of reasons - but I wonder if their automatic system is more accurate than "looking at the colors"... See below for side by side results...

We are planning to do several back to back phosphate treatments in hopes of getting the #s down - that first phosphate treatment/filter cleaning didn't seem to do anything.
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