Pool looked a bit cloudy 5 or 6 days ago, and then 4 days ago (Monday) an algae bloom hit. Came VERY fast, possibly because the pool water temp was up around 95F due to the solar heater valve acting "backwards".
Turned pump on 24/7 on Monday night and I put 3 jugs (576 oz) of 6% bleach into the pool.
Then on Tuesday we took an early morning sample to local pool store, and had them run water tests. They came back with 5.0ppm FC and I think 1ppm CC. Figured we must still be having some activity, so put a 2.5 gallon jug of 10.5% chlorine in around noon on Tuesday and then another jug around 9PM Tuesday. Was looking better (not green but somewhat cloudy). Cleaned filter and kept pump running Tuesday night.
Wednesday morning it was looking better (not green/slightly cloudy). Another pool store sample came back with 5.0ppm FC so we put another 2.5 gallon jug in around noon on Wednesday just to be sure.
Thursday morning (today), pool looked pretty good. Dull, but decent. Pool store results came back as:
5PPM FC (Hmmmmm).
0.0PPM Combined Chlorine.
125 PPM TA.
375 PPM Calcium Hardness
60 PPM Stabilizer
4200 ppm TDS
Pool store talked us into adding 3 cups of acid this afternoon to try to bring down the TA cause it was just over their high range of 125ppm. We did that around 2PM but now I regret it. The kids swam for a couple hours around 5:30PM.
The good news is my test kit came today. Here are the results from this evening from my first ever self-tests taken around 8PM:
30ppm FC (?!?!?!?!)
1ppm CC (kids?)
60 PPM TA
400 ppm CH
20 ppm CYA
Pool is clear but dull.
1) Where did all that FC come from? The quick color match test showed off the chart and then the dropper test gave 30ppm (repeated 2x) so I think it's more reliable than the pool store. Still, with the sun shining on the pool ALL DAY, I'm surprised it was so high. No chlorine (other than the muriatic) was added since the pool store gave a reading of 5ppm today. Could the pool store test be that far off (5ppm vs 30ppm??)? It is kinda fishy that all of the tests they've done this week came in at 5PPM FC.
2) Is it reasonable that the 3 cups of acid would drop the TA that much (125PPM down to 60PPM)?
3) 20 ppm CYA vs the pool store's 60??? That test seems so subjective, but I did it twice. Frankly I could still see just a bit of a shadow of a dot both times. Every pool store test for the past 3 months has shown 60-70ppm stabilizer. In fact, when we first got the pool going (bought a short-sale), they had us add a bottle of granular stabilizer at one point (probably about 32oz bottle).
4) How big of a deal is a warm pool (90-92F) to water chemistry? Everyone here likes it warm.
5) What should I do next?