Black Algae Vinyl Pool Liner

Your marks sound like organic stains that will fade away slowly as long as you keep chlorine in the pool.

Black algae vinyl pool liner.

Black algae will dot the liner in black spots. These organisms are tough and have a thick coat to resist chlorine effects. Over the last 12 yrs i have probably looked at over 100 inground vinyl pools with this black mold growth under the liner. Don t leave the chlorine on the spot for too long as it may bleach the liner.

Bacteria sometimes show up years after a pool has been installed. It s more at home in concrete plaster or gunite pools because they re porous surfaces the organism can really latch onto and even grow roots past the surface. For a semi bad part. As long as you are losing fc overnight you still have something organic in the water that needs to be taken care of so you should continue shocking.

These micro organisms develop colonies behind the liner and left unchecked eventually will permeate through to the printed side appearing as dark gray or black splotches. What differentiates it from algae is that it s more of a parasitic type organism says terry arko water specialist for seaklear pool spa products based in bothell wash. You can also use about 1 2 lb. 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.

Also black algae seldom forms in pools with fiberglass or vinyl liners. A few other ways to recognize black algae in your pool. This type of algae forms in a layered structure with the outermost layer protecting the lower layers. It appears as dark black spots on the walls and floor of the pool and is slippery to the touch.

Black algae is a thread like growth that develops on rough surfaces in swimming pools. Black algae is almost unheard of in vinyl liner pools. The resistant coating will become weak and break. Of calcium hypochlorite granular chlorine in an old sock to put on a spot.

To remove them start with a rigorous brushing using a nylon brush. Alot of people initially treat it chemically as a algae growth major shock treatment in addition to a special algaecide. We think the bacteria can be washed into your pool area by flooding rains or when a septic tank overflows. 5 10 minutes max.