Black Spots On Vinyl Pool Liner

Metal staining and black algae.

Black spots on vinyl pool liner.

Algae are diverse simple plants that thrive in water. To confirm it s a metal stain get a vitamin c tablet crushed up acsorbic acid put that in a sock and place it on the stain. Of calcium hypochlorite granular chlorine in an old sock to put on a spot. Find the problem and work on it using the methods discussed here or find yourself a self cleaning pool.

Too much copper iron calcium or salts can all result in vinyl liner staining or marks. The stain colors range from yellow to brown to black. If the stain lightens from a small application of chlorine on it the stain is organic in nature. Black algae in a vinyl pool is possible but not very likely.

They are telling you that something somewhere is not alright. Black stains on vinyl pool liner are not the best sight. Nylon brushes will not work. Of all the alga types and species on the planet black algae can be the most difficult to treat and most resilient to remove from a swimming pool.

Black algae can get into your pool several ways but one of the most common is from swimming suits that have been in the ocean source. Brush every black algae spot with a steel bristle brush to remove the protective layer. If the stain is on your vinyl pool steps try jack s magic step stuff. You can also use about 1 2 lb.

If you have a vinyl lined pool do not use a wire brush as this can tear the liner shock or super chlorinate the pool using granular chlorine also known as calcium hypo chloride. You can also use about 1 2 lb. Vinyl pool stains can be removed with acidic stain removal products like stain free or a stain remover or jack s magic blue stuff for vinyl liners. 5 10 minutes max.

For a semi bad part. Depending on the type of stain different treatments are required to correct the problem. Mineral and metal stains. We think the bacteria can be washed into your pool area by flooding rains or when a septic tank overflows.

If you have black or grey cloud like stains on the floor of your in ground vinyl liner they are most likely caused by bacteria that is living in the ground under your pool. Alga spores may always be present in your pool but problems arise when the right conditions are present and the algae are able to bloom. Of calcium hypochlorite granular chlorine in an old sock to put on a spot. Don t leave the chlorine on the spot for too long as it may bleach the liner.

If the stain doesn t lighten up gets darker or the color changes to black it s probably a metal stain. If you do it right you should not have any black stain problems and will be able to keep your pool clean. Copper iron and manganese may be introduced into the pool via source water. Maintain proper pool chemistry levels.