Drain the Water
Turn off all the electricity going to your pool equipment so that when you drain the water, you don’t damage your pump, filter, pool or spa light, booster pump or heater. Place the submergible pump in your pool. Toss the output end up on the deck of your pool and then out into the street, if you are able to drain to the ocean. If you need to drain to the sewer, position the output hose into the backwash or the clean-out drain. Place the output hose into your toilet if you are not allowed to drain into the street or the sewer. If you use this option have someone watch carefully for overflow.
Large stains covering a high percentage of the swimming pool plaster surface are usually from chemical reactions. These tips are for smaller, concentrated swimming pool stains, a few inches or less in size.
A small swimming pool stain is usually caused by a metal object being left on the plaster bottom long enough to rust and leave a stain. Most metals, when subjected to swimming pool water chemicals, will react and leave a stain where they were in contact with the pool’s plaster.
The most common objects to stain swimming pools are soda or beer cans, pop tops, and coins. These items can cause a stain as quickly as overnight. That’s why it is important to remove any metal objects from the pool as soon as possible.
There are three ways to remove stains of this type:
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