How do you remove black and gray stains on the floor of a fiberglass pool left by leaves earth worms that an acid wash did not remove?

Here are a few methods you can try to remove black and gray stains on the floor of a fiberglass pool that were left by leaves and earthworms and could not be removed by an acid wash:

1. Chlorine Shock Treatment

- This method involves using a high dose of chlorine to oxidize and remove stains.

- Dissolve a large quantity of chlorine in water and pour it into the pool.

- Let the chlorine circulate for several hours or overnight.

- Scrub the stains with a soft brush or pool brush while the chlorine is active.

- Rinse the pool thoroughly after the stains have been removed.

2. Hydrogen Peroxide Treatment

- Hydrogen peroxide is a natural bleaching agent that can be effective in removing stains.

- Mix hydrogen peroxide with water in a ratio of 1:1.

- Apply the mixture to the stains and scrub them with a brush.

- Leave the mixture on the stains for several hours or overnight.

- Rinse the pool thoroughly after the stains have been removed.

3. Oxygen Bleach Treatment

- Oxygen bleach is another effective stain remover that can be used on fiberglass pools.

- Dissolve oxygen bleach in water according to the manufacturer's instructions.

- Pour the mixture into the pool and let it circulate for several hours or overnight.

- Scrub the stains with a brush while the oxygen bleach is active.

- Rinse the pool thoroughly after the stains have been removed.

4. Metal Stain Remover

- If the stains are caused by metals such as iron or copper, you can use a metal stain remover specifically designed for pools.

- Follow the manufacturer's instructions for using the metal stain remover.

- Most metal stain removers require you to apply them directly to the stains and scrub them with a brush.

- Rinse the pool thoroughly after using the metal stain remover.

5. Abrasives

- For tough stains, you can try using a mild abrasive such as baking soda or pumice powder.

- Create a paste by mixing the abrasive with water.

- Apply the paste to the stains and scrub them with a brush.

- Be careful not to use too much pressure, as this could damage the fiberglass surface.

- Rinse the pool thoroughly after using the abrasive.

It's important to note that some stains may be permanent and may not be completely removed. Always test any cleaning solution in a small, inconspicuous area before applying it to the entire pool.