Green pool after rain

[FloridaPoolNewbie]

In Florida and relatively new pool owner. FC kept recently in the 4-6 range (SWG). Today we had massive rains ~6-8", pool overflowed and became green within a couple of hours of rain.

I'm currently pumping water out of the pool and set my SWG to 100% purification to boost the FC. What are your thoughts? Should I run a higher FC daily? When would a good re-test time be for the water?

Recent pre-rain chemistry below...
FC- 4.5
PH- 7.5
TA- 110
CH- 300
CYA- 80
Salt- 3300

 

[Texas Splash]

I would just do all the water release you need to then run a new set of test results. Post back and we'll help you based n those new numbers. Curious though, any chance debris from the yard overflowed into the pool during this rain? It's odd for a pool to turn green just from a downpour.

 

[FloridaPoolNewbie]

I would just do all the water release you need to then run a new set of test results. Post back and we'll help you based n those new numbers. Curious though, any chance debris from the yard overflowed into the pool during this rain? It's odd for a pool to turn green just from a downpour.

It's a zero scape yard with rocks, some pinestraw around. We do have metal garden planters nearby and I'm wondering if the rainwater didn't leach out a ton of soil and fertilizer into the pool. I'm thinking my FC was on the low end to begin with and that didn't help.

 

[FloridaPoolNewbie]

Test results after a few hours, drained water, added 40# of salt (SWG showed 2200 initially), and am running 100% purification. Pool is getting better but still quite green.
Salt-3500
FC- 4
PH- 7.5
TA- 70
CH- 200
CYA- 80 (surprised this didn't drop)

 

[mknauss]

Raise your FC to 20% of CYA level and see if it clears overnight.

 

[Texas Splash]

I have a feeling the FC simply dropped a bit too much. You might consider doing an Overnight Chlorine Loss Test this evening. If you have some liquid chlorine or regular bleach, add some to get the FC up to about 7-9 this evening. I'm sure the water could use it now. Turn off the SWG about 30 minutes before taking your first nighttime FC sample.

 

[FloridaPoolNewbie]

Raise your FC to 20% of CYA level and see if it clears overnight.

So just to confirm, raise FC to 16? I can't exactly select this, I just have to pump the sanitizer at 100% and check periodically until I hit a desired number.

 

[mknauss]

Use liquid chlorine. Do not try to out run an issue with a SWCG. It is too slow.

 

[FloridaPoolNewbie]

Use liquid chlorine. Do not try to out run an issue with a SWCG. It is too slow.

I have liquid Clorox, any direction on how to do this?

 

[mknauss]

Check the Clorox, if it shows Cloromax, that is not good for the pool.

Use PoolMath for how much to use. In a 5000 gallon pool, you need about 3 quarts of 10% liquid chlorine.

 

[FloridaPoolNewbie]

Check the Clorox, if it shows Cloromax, that is not good for the pool.

Use PoolMath for how much to use. In a 5000 gallon pool, you need about 3 quarts of 10% liquid chlorine.

It's actually Publix brand regular bleach...7.5% sodium hypochlorite.

 

[mknauss]

OK -- does it say Fabric Protection Technology on it? Or FPT? That is the same stuff as Cloromax.

With 7.5%, add an entire gallon.

 

[FloridaPoolNewbie]

OK -- does it say Fabric Protection Technology on it? Or FPT? That is the same stuff as Cloromax.

With 7.5%, add an entire gallon.

Nope. Just regular old bleach.

 

[mknauss]

Nope. Just regular old bleach.

Great. Hard to find in most places.

 

[FloridaPoolNewbie]

Quick thank you to the folks here on this thread. The forum is wonderful, and I very much appreciate your help!

 

[FloridaPoolNewbie]

OK -- does it say Fabric Protection Technology on it? Or FPT? That is the same stuff as Cloromax.

With 7.5%, add an entire gallon.

How long would this take to stabilize in the pool? AKA, when would I take the next FC test?

 

[mknauss]

If you want to do a Overnight Chlorine Loss Test, let the pump run for about 30 minutes and then test for FC. Then in the morning, before sun hits the pool surface, run the pump for 30 minutes and test FC again.

 

[FloridaPoolNewbie]

If you want to do a Overnight Chlorine Loss Test, let the pump run for about 30 minutes and then test for FC. Then in the morning, before sun hits the pool surface, run the pump for 30 minutes and test FC again.

Will do, FC at 13.5 now (had a little less than a gallon available of bleach). Will test in the AM.

 

[FloridaPoolNewbie]

If you want to do a Overnight Chlorine Loss Test, let the pump run for about 30 minutes and then test for FC. Then in the morning, before sun hits the pool surface, run the pump for 30 minutes and test FC again

Would you recommend I run a higher FC going fwd. to prevent this from heavy rains again? Perhaps 7-8 FC?

 

[mknauss]

In your climate, with lots of airborne algal spores and rain events, I would run 10% of CYA for FC. Give you more buffer.