What does rain do?

[Traveller]

As I have said in other threads, my first 2 years of pool ownership were at the mercy of the pool store and their magical water analysis print-out and resulting shopping list. This year I have found this forum and am actually trying to figure out what each chemical does. Also, my pool is looking great this year due to the BBB program.

Our weather forecast says storms are on the way, so I am wondering what rain does to water chemistry?

 

[woodyp]

Rain is generally PH neutral, but it causes a rise in PH in my pool by breaking the water surface much like a foutain or water feature would. Generally brings dirt along with the wind so I bump up FC in advance of it.

 

[Richard320]

Short term, things will look weird. A day after it stops and it's had time to mix well, not much difference.

Although a big rain does wonders reducing CH if you can pump out before the storm to make room.

 

[Traveller]

Thanks.

 

[Jamison04]

Depends on where you live. Some areas have more acidic rain. A lot of rain can sometimes marginally lower your pH and TA not enough to worry about tho. Usually there is more dirt and debris in the pool from the rain that is more of a headache than anything.

 

[duraleigh]

Rain has never had much affect on my pool. Others report some dramatic pH changes but I suspect, as others report above, the water simply hadn't mixed well yet.