Hello everybody! I'm here for some advice in lieu of my buddy who has been shocking his pool first to 20ppm FC and then later having bumped it to a target minimum of 30ppm FC due to a recent algae bloom that may be mustard algae. He's in Central Florida and has a 1718 gallon above-ground vinyl pool that he brought down to a pH of about 7.2 before starting the SLAM. Him and I have consulted together trying to follow TFP ideas on SLAM and it's been about 3-4 days that he's been in this process and he is using liquid chlorine.
Pool Stats:
1718 Gallons Above-ground Vinyl Pool
50ppm CYA
pH lowered to 7.2 before start of SLAM
10.5% Liquid Chlorine
0ppm CC every test
330GPH Cartridge Pump
We are both quite confused as to how he is supposed to maintain SLAM levels when he goes out to work in the daytime from the times of 3pm-12am. The pool's FC levels drop significantly due to the sun, sometimes more than 10-15 FC during the day when he is not around to add liquid chlorine. Are these significant dips harming the mustard SLAM process? I read around that at his CYA levels of 50ppm he should be maintaining an FC of at least 30 for multiple days (and/or?) until he has no FC loss to ensure having killed off mustard algae.
It took at least two nights of blatant FC loss, but on the third night, he got two readings about an hour-and-forty minutes apart from one another that both returned as 32ppm FC in the pool. His target FC for those two measurements was 33ppm at the time. He ended up running out of FC test reagents and unfortunately couldn't continue testing that night for any more data. The following night since then had shown varying amounts of FC loss in the tests that were done approximately 3 hours apart from one another. One test returned about 6.5-8ppm FC loss and the next one returned 1ppm FC loss.
His pool had started out increasingly cloudy with greenish/brown dust on the bottom that poofed into a cloud if you disturbed it. He had taken care to vacuum the pool with his garden hose-powered vacuum on low pressure with additional socks within the mesh bag to catch as much of the algae dust as possible, and then on a following day, brushing around the floor of the pool to stir up dust that was settling in places. The pool has gotten significantly clearer each day even though it seems some algae dust might still be present around the seams in the floor. He has a 330gph cartridge filter pump that has been running 24/7 from the start of SLAM and rinsed out approximately every day during the SLAM process. At least one of those times the filter was entirely yellow-green. It seems things are definitely improving, but we are confused in how he can end this ordeal because he is tired of the repeated nightly testing and the bleach fumes. To us it seems clear that he needs to keep going to hopefully eradicate this potential mustard algae because it would be a waste of effort if he stopped sooner than he should and then it decides to grow back in a week or two.
I wanted to know if anyone could please shed some light on these points:
1. Why might his FC loss be fluctuating all over the place when some times it seems like it's practically done and then it hits like a truck the next time?
This next question below is the one I'm most concerned about:
2. How is he supposed to maintain 30ppm FC during the day when he's out of the house and the sun eats anywhere from 10ppm FC and up? (One reading on the second day said 18.5ppm FC was lost from 5:00am to 2:30pm!)
Thanks for reading and thank you to anyone who decides to offer any ideas!
Pool Stats:
1718 Gallons Above-ground Vinyl Pool
50ppm CYA
pH lowered to 7.2 before start of SLAM
10.5% Liquid Chlorine
0ppm CC every test
330GPH Cartridge Pump
We are both quite confused as to how he is supposed to maintain SLAM levels when he goes out to work in the daytime from the times of 3pm-12am. The pool's FC levels drop significantly due to the sun, sometimes more than 10-15 FC during the day when he is not around to add liquid chlorine. Are these significant dips harming the mustard SLAM process? I read around that at his CYA levels of 50ppm he should be maintaining an FC of at least 30 for multiple days (and/or?) until he has no FC loss to ensure having killed off mustard algae.
It took at least two nights of blatant FC loss, but on the third night, he got two readings about an hour-and-forty minutes apart from one another that both returned as 32ppm FC in the pool. His target FC for those two measurements was 33ppm at the time. He ended up running out of FC test reagents and unfortunately couldn't continue testing that night for any more data. The following night since then had shown varying amounts of FC loss in the tests that were done approximately 3 hours apart from one another. One test returned about 6.5-8ppm FC loss and the next one returned 1ppm FC loss.
His pool had started out increasingly cloudy with greenish/brown dust on the bottom that poofed into a cloud if you disturbed it. He had taken care to vacuum the pool with his garden hose-powered vacuum on low pressure with additional socks within the mesh bag to catch as much of the algae dust as possible, and then on a following day, brushing around the floor of the pool to stir up dust that was settling in places. The pool has gotten significantly clearer each day even though it seems some algae dust might still be present around the seams in the floor. He has a 330gph cartridge filter pump that has been running 24/7 from the start of SLAM and rinsed out approximately every day during the SLAM process. At least one of those times the filter was entirely yellow-green. It seems things are definitely improving, but we are confused in how he can end this ordeal because he is tired of the repeated nightly testing and the bleach fumes. To us it seems clear that he needs to keep going to hopefully eradicate this potential mustard algae because it would be a waste of effort if he stopped sooner than he should and then it decides to grow back in a week or two.
I wanted to know if anyone could please shed some light on these points:
1. Why might his FC loss be fluctuating all over the place when some times it seems like it's practically done and then it hits like a truck the next time?
This next question below is the one I'm most concerned about:
2. How is he supposed to maintain 30ppm FC during the day when he's out of the house and the sun eats anywhere from 10ppm FC and up? (One reading on the second day said 18.5ppm FC was lost from 5:00am to 2:30pm!)
Thanks for reading and thank you to anyone who decides to offer any ideas!