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Black algae is very hard to get rid of You need to get down there with something an scrub the surface of the algae. this will damage it so that algaecides will be able to penetrate it Hit the pool with a suitable algaecide you will be able to get this at your pool shop and also try putting some dry chlorine in a sock and place it directly on the worst affected areas, leave it for a while and see what happens.

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Q: How can you remove black algae stains from the floor in the deep end of a vinyl lined inground pool?
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What is a reagent that stains the stored food of a green algae black?

I2KI Just had this bio question on my test.


What do you do if your pool has green algae and black algae spots?

If it is genuine 'black algae' it is very difficult to remove without emptying the pool and gouging the black algae out of the pool surface. Other algae can be removed by shocking the pool, filtering continuously and brushing walls while maintaining a good sanitizer level.


What is the largest brown algae?

Some of the types of algae are staghorn algae, black brush or beard algae, green spot algae, and green thread hair algae. Other types of algae are green water algae, and black green algae.


If you have a severe black algae problem that you have been mitigating for years and can't get rid of can getting a very dark blue liner help to hide the black algae stains?

In a word ~ NO. If the algae bloom is that severe maybe a replaster is in order. Sounds like you need to be more diligent on chemistry in the pool along with proper filtration among other things. Sounds like a problem of neglect. Black algae will bore into the plaster unlike green algae. It is very difficult to get rid of especially on rough plaster. You cannot cover over it or paint over it. Oh, the dark blue liner or any liner can and will cover and hide the algae problem but you will still have the algae problem and in fact compound the problem. The algae could bore through the new liner and then where will you be - - right back in the same boat. k


What causes black algae?

There is no such thing as actual black algae. It is just a name given to crystallized green algae. Green algae that can not flourish will die and crystallize and try to grow again and again in the same spot forming those black buds. Usually you will get black algae from keeping a constant level of chlorine say 3 to 5 ppm's and not shocking (Raising the chlorine level over 10 ppm's) the pool often enough.

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How do you remove dark stains from the bottom of a swimming pool that are getting bigger day by day?

For marcite or plaster finish - Acid Wash. Google "acid wash" . Also Pumice stone will srub off black or green algae.


How do you remove small black stains from diamond brite surface?

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What are black-brown stains on the bottom of the liner that can not be scrubbed off but once the pool cover is on for a day or two the stains vanish?

It sounds like some sort of algae when you expose it to the pools water it brings it under controll.


Why has Burnout 35 left black stains on the bottom of a plaster pool and how can you remove them?

This must be an algaecide of some sort possible a low grade of chlorine. Did you follow the instructions EXACTLY? Is this product supposed to settle on algae spots? If not , did you brush it to keep it from clumping and settling on the bottom of the pool? The black stains, possible caused by the product burning the plaster where it settled --- improper use of product. Impossible to know without seeing the stains and finding out just how you used the product. Contact Bioguard for further info.


Will power-washing remove Black Algae from a Gunite pool?

Probably not. Since "Black algae" has a crusty layer over it you will need to use something abrasive to break open the spores. Get a product that says "for black algae" We usually increase the chlorine levels too (if no one is using the pool)