So the pool turned green last week. This is only the second time in the fours years I have had it but I can't seem to kill the algae.
I have been using PACE - Clear Shock 99% sodium dichloro-s-triazinetrione hydrated to shock the pool.
I added a couple of bags of shock last Friday and ran the filter for a day and no change. Still green. I got out the test kit and started monitoring the pool for the last couple of days while treating. Here are the results over the weekend:
ph - 7.4
TA - 80
FC - 25-28
CC - 0
CYA - Assumed around 50, did not measure
So after another two days of adding shock to keep FC close to 30 I finally measured CYA and it looks like CYA is around 80-90.
Here are last nights numbers
ph - 7.4
TA - 80
FC - 26
CC - 0
CYA - 80-90
I read the CYA/shock chart in pool school and it looks like for my CYA level and it looks like I my FC never reached shock level (close to 40). I added another bag this morning and the FC is 48 and CC - 0. I'm hoping to see some progress when I return from work tonight.
Here are my questions:
First any suggestions on anything else I should do?
Is my shock product adding CYA?
At what chlorine level should we go swimming again?
If I lower FC back 3-5 will my pool still be sanitized with the high CYA levels?
Once I kill the algae should I lower the FC with sodium Thiosulfate back to 3-5 ppm?
Should I drain/refill to lower CYA or will it go down over time?
I have been using PACE - Clear Shock 99% sodium dichloro-s-triazinetrione hydrated to shock the pool.
I added a couple of bags of shock last Friday and ran the filter for a day and no change. Still green. I got out the test kit and started monitoring the pool for the last couple of days while treating. Here are the results over the weekend:
ph - 7.4
TA - 80
FC - 25-28
CC - 0
CYA - Assumed around 50, did not measure
So after another two days of adding shock to keep FC close to 30 I finally measured CYA and it looks like CYA is around 80-90.
Here are last nights numbers
ph - 7.4
TA - 80
FC - 26
CC - 0
CYA - 80-90
I read the CYA/shock chart in pool school and it looks like for my CYA level and it looks like I my FC never reached shock level (close to 40). I added another bag this morning and the FC is 48 and CC - 0. I'm hoping to see some progress when I return from work tonight.
Here are my questions:
First any suggestions on anything else I should do?
Is my shock product adding CYA?
At what chlorine level should we go swimming again?
If I lower FC back 3-5 will my pool still be sanitized with the high CYA levels?
Once I kill the algae should I lower the FC with sodium Thiosulfate back to 3-5 ppm?
Should I drain/refill to lower CYA or will it go down over time?