Pool water turned green in one day!

Stains on the pool surfaces, pool equipment
or on the swimmers, or off-color swimming pool
water. Discolored but clear pool water.

Pool water turned green in one day!

Postby Guest » Tue 20 May, 2008 16:30

I finally got my pool just where I wanted it about two weeks ago, crystal clear blue. But we are selling our house so I put ascorbic acid in to clean some brown spots off of the steps and seat. It is an in-ground vinyl pool, 37x19.

The ascorbic acid worked great, but the water was a bit cloudy afterward, not too bad. But yesterday my son and dog were in the pool, and afterward I noticed some greening. But today the entire pool is a light shade of green!

My pH was a little low, about 7-7.2 and my chlorine looked to be between 4-6. I just added some baking soda to get the pH up, but what else can I do? It won't help the sale of our house ;)


chem geek
Pool Industry Leader
Pool Industry Leader
Posts: 2382
Joined: Thu 21 Jun, 2007 21:27
Location: San Rafael, California

Postby chem geek » Tue 20 May, 2008 20:51

Ascorbic Acid is a reducing agent so probably used up all of the chlorine in the water and then algae took hold. You need to shock the pool with unstabilized chlorine and recognize that some of it may get used up right away if there is still leftover Ascorbic Acid in the water.

Normally when you use an Ascorbic Acid treatment, you want to add some PolyQuat 60 to the water first so that you'll have some protection against algae growth.


Postby Guest » Tue 20 May, 2008 20:59


Thanks for the help. I wanted to ask what is unstabilized chlorine? I had been using the shock from Sam's Club, along with Clorox here and there. Are both of those alright?

Swimming Pool Superstar
Swimming Pool Superstar
Posts: 332
Joined: Fri 07 Mar, 2008 20:56
Location: Maryland

Postby muss08 » Tue 20 May, 2008 23:13

Check the active ingredient in the shock. Cal Hypo is unstabalized while dichlor and trichlor are stabalized. You can also use regular unscented clorox
APSP Certified Service Pro
Jandy Tech School
Pentair Tech Training
Raypak Heater School
5 yrs experience

Postby Guest » Wed 21 May, 2008 18:42

Thanks everyone for the help! I really appreciate it.


Return to “Pool Surface Staining & Discolored Pool Water”

Who is online at the Pool Help Forum

Users browsing this forum: No registered users and 1 guest