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Greetings, Sensei of swimology.

I have a concrete pool-about 10 years old. This year (I think possibly due to the extraordinarily mild winter), our algae was a nightmare to get under control. To achieve clear water, we did a few rounds of shock at 100oz Day 1, 70 oz Day 2 , and 30 oz Day 3. Our pool is 39,000 gallons.

Finally, the pool is clear and the water is well balanced.

But we have a lot of algae that is adhered to the walls & floor that simply will not brush off-and is still green. We do brush it & the water clouds up until the filter pulls out the algae that is floating, but we still have algae embedded.

Our filter is a DE system, about 2-3 years old.

For the last couple of years, we moved away from the stabilized tablets because our water was "over-stabilized" to quote our local guy.

How do we remove the embedded algae?

Thank you.

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post a full set of test results not done with strips. Chlorine will kill the algae but it has to be high enough to compensate for the high stabilzier level you hsay you have.

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Your prob sounds near to my problem but I am getting it under control. I am not sure if the black substance I see is algae but I am treating it as such -- I have messed up not cleaning my filters when I saw an algae outbreak -- this was embarrassing at a recent function which was suppose to be a pool party. I have learned my lesson. So now I have this black substance which could have come from using muriac acid - I think I have seen this substance last year but didnt recognize it as algae. I have read to take chlorine tablets and scrub the substance...well this is impossible -- I have scrubbed the areas of the wall and it works but no way will I do this for the entire pool -- for the substance at the bottom, I placed 2 tablets at the bottom and I am allowing the chlorine to bleach away the stains -- yes I have bleached circles stains at the bottom which looks better than the black substance which is either embedded algae or .... if you have problems with the walls, a good shock system should do the problem then use some chemicals for cloudy pools and patience. I have not found scrubbing the walls with an steel algae brush to be a problem, I brush every day. Be careful how much money you are spending and how many chemicals the pool supply store tries to sell to you -- one in particular is known for pushing chemicals -- the blue chemical for black algae did not work for me. I am also using a DE filter and keeping the filters cleaned and with the right about of DE makes a difference -- this is my 3rd year of having a pool and each year I learn something new -- I will create a pool cleaning bible for me to refer to next year so I do not repeat the same dumb moves. Each year, I have drained the pool because by September I am beat up with spending money and time. DIY is better than paying $75 to $90 per month. Good luck

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Do not use a stainless brush on a painted concrete, vinyl liner or fiberglass pools.

Scott

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