Water Chemistry Issues after Heavy Rain.

martinezj1120

Well-known member
Nov 28, 2018
68
Michigan
HI everyone,

I have been pretty on top of my water chemistry with this help of this forum and pool math. I do a full range of test once a week and check my PH and CL probably every other day. So far so good as the pool looks and feels great! We have been out of town the past two days and received some pretty heavy rains last night. Want to get the pool ready for today and decided to do a full test.

FC 7
PH 8.2
TA 100
CYA 30
Salt 3400

Only owned a pool for 2 seasons now but my #'s have never been this far off, especially my PH and TA, even my CYA has dropped some. Plugging all these #'s into pool math has me feeling a little overwhelmed. What is the best way to tackle my #s to get them back in line. Which one do I tackle first? I would assume PH and TA, as my ideal PH is around a 7.4-7.6 and TA is usually around a 70-80. Any advice is appreciated. Thank you!

BTW, water looks fine but nervous about the kids jumping in with my #s like this.
 

Richard320

TFP Expert
LifeTime Supporter
Jan 6, 2010
23,932
San Dimas, CA (LA County)
Your TA should not have risen from the rain. Rain water should be pretty close to distilled water.

pH will rise from aeration of the raindrops n the surface.

Salt, CYA, and CH should all have gone done by roughly the same percentages as, again, rainwater should be pretty close to distilled water. And whatever percentage they dropped, your TA should have dropped about the same.

Adjust the pH and let the kids in fifteen minutes later. You can mess with CYA and salt with them in the pool. 7 FC is well below SLAM level for 30 CYA.
 

martinezj1120

Well-known member
Nov 28, 2018
68
Michigan
Your TA should not have risen from the rain. Rain water should be pretty close to distilled water.

pH will rise from aeration of the raindrops n the surface.

Salt, CYA, and CH should all have gone done by roughly the same percentages as, again, rainwater should be pretty close to distilled water. And whatever percentage they dropped, your TA should have dropped about the same.

Adjust the pH and let the kids in fifteen minutes later. You can mess with CYA and salt with them in the pool. 7 FC is well below SLAM level for 30 CYA.

Thanks. I added dry acid to drop my PH and I will see what happens.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
37,085
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
I added dry acid
As you have a SWCG, it is not advised to use dry acid. The sulfates will build up in your pool water and can slowly destroy metals, aka your SWCG. Use muriatic acid instead.
 
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