I'm not sure if this should be here or in the algae forum.
Following the directions of the pool store/installer I had been using a dichlor shock to both shock the newly opened pool and then to maintain the FC level. I'll add that the pool is new to me this season and there may be an issue with the SWG. Prior to 10 days ago the pool looked and test good. I had a report from the pool store tester that had the CYA level at 125 ppm. Though I am not a pool person, from what I could read, this was too high. That sets the story, now my question.
I had an algae bloom, for what ever reason, and I noticed just prior to that my test strips were indcating a lower CYA level. After the bloom those results repeated, both with a strip and with a droplet chemical tester. I began to wonder if pool store #1 needed calibration. So I brought a water sample to store #2 and got a test result of 24 ppm, consistent with my lesser grade at home tests. From what I can read CYA does it naturally change that much that quickly.
I am left wondering if there's a calibration problem or ... could the algae be responsible for the apparent drop in CYA ? Can pro testers be that far off?
Following the directions of the pool store/installer I had been using a dichlor shock to both shock the newly opened pool and then to maintain the FC level. I'll add that the pool is new to me this season and there may be an issue with the SWG. Prior to 10 days ago the pool looked and test good. I had a report from the pool store tester that had the CYA level at 125 ppm. Though I am not a pool person, from what I could read, this was too high. That sets the story, now my question.
I had an algae bloom, for what ever reason, and I noticed just prior to that my test strips were indcating a lower CYA level. After the bloom those results repeated, both with a strip and with a droplet chemical tester. I began to wonder if pool store #1 needed calibration. So I brought a water sample to store #2 and got a test result of 24 ppm, consistent with my lesser grade at home tests. From what I can read CYA does it naturally change that much that quickly.
I am left wondering if there's a calibration problem or ... could the algae be responsible for the apparent drop in CYA ? Can pro testers be that far off?