We took the cover off our pool a couple of weekends ago and the pool was green but very clear. Normally we would then fill the pool, set up the pump, vacuum the bottom to waste, adjust chemicals & SLAM it. This year, life got in the way for a couple of weeks, so by the time we got back to opening the pool last Saturday, it was a green swamp & the bottom was no longer visible. My husband went ahead with the normal process & added in 1 gal of sodium hydrochloride.
After that, these were the initial readings:
** We calculated the CYA, since we were out of the reagent, based on our last reading prior to pool closing being 40 & replacing 1/4 of the water through the closing & opening process.
Before bed, we added another gallon of sodium hydrochloride to SLAM it. We didn't have any PH decreaser to adjust PH.
On Sunday night, the FC was back to 0 & we added another 190 oz of sodium hydrochloride.
On Monday, I went to the pool store with a water sample.
Here were their readings:
CYA = 63
I was confused why their CYA reading was so high, but went ahead last night & added 3 gal of sodium hydrochloride to SLAM it. We also added 1.5 lb of PH decreaser.
This morning, I got the following readings:
Based on the above, I'm thinking the CYA was NOT really 63. Unfortunately, I didn't buy any CYA reagent to check it myself, because I figured it wouldn't change from the store's reading of 63.
Wdyt the CYA is based on the above info? I can't get back to the store again today to buy more reagent, but I want to continue the SLAM.