Will Acid Washing Eliminate Algae

panamax53

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Dec 10, 2015
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Doral, FL
We are getting too old and I have a shoulder injury that is aggravated by brushing the pool. I carefully maintain pool chemistry with fairly high FC levels in the 7 - 11 range.
We have been diagnosed with having brown or black algae. We get different opinions. I was of the opinion it was from the pool heater, but now am doubting that. I have tried brushing, slamming and nothing seems to have worked.
I was thinking maybe having the pool acid washed this winter to fix the problem.
Will that work?
 

gingrbredman

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Jun 10, 2020
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Chicagoland
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11200
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Pentair Intellichlor IC-40
I was thinking maybe having the pool acid washed this winter to fix the problem.
Will that work?
The short answer is no.

As @PoolGate mentioned, with enough chlorine, no algae will be there. The solution to an algae problem is a SLAM, which requires chlorine, not acid.

I have tried brushing, slamming and nothing seems to have worked.
Tell us more about the attempt to SLAM. With a true SLAM, you need to first test everything, adjust the PH, and then you would raise your Clorine levels. I haven't seen a SLAM that goes until completion that hasn't worked so curious what went wrong.
 

proavia

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Feb 6, 2015
3,752
Chandler AZ
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If you have visible algae, use the SLAM Process. It works.
Have you done an Overnight Chlorine Loss Test - with the SWG off?

Can anyone else in the household help with brushing the pool? How about neighbors or friends?
A commitment to brush at least once a day during the SLAM Process will help ithe SLAM go faster. Also, after SLAM completion, the pool should be brush weekly.

The pool heater won't cause algae.

I see you have linked your PoolMath logs here. Enter all your results in PoolMath.
FC
CC
pH
TA
CH
CYA
Salt
Water temperature
 
Last edited:

Katodude

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Aug 22, 2017
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West Palm Beach/Florida
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Hayward Aqua Rite (T-15)
The OP says that he has black algae. Slam wont work.

Can you post pictures? Can you scrape off a bit of algae and smear it on a piece of paper? Is it a lot or a little bit?
 

duraleigh

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Apr 1, 2007
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OP reports black algae but that is seldom what the problem really is. The SLAM will work for any algae. Black algae (when confirmed) takes a different path as to cleaning, brushing, filtering but it should still be under the guidelines of a SLAM.

First things first, OP should post pics or give more info to diagnose black algae properly.
 
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tim5055

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May 11, 2014
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OK, you have a test
First things first, OP should post pics or give more info to diagnose black algae properly.
Agree

With a test kit in hand step one is always to properly diagnose the problem. As someone mentioned the heater, could it be staining and not algae?

I say before you go in any direction you preform an OCLT to show that it is in fact algae.

 
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