N
The Daily Insight

How do I get rid of stains in my pool without draining

Author

Gabriel Cooper

Updated on April 19, 2026

A no-drain acid wash is arguably the best method to restore your swimming pool to its former glory without damaging its surface in any way. It is also much more cost and time-effective than many other stain removal methods. As the name implies, it refers to acid washing the pool without draining it.

How do you clean a stained pool without draining it?

  1. Add 16 oz of Super Stain Away per 10,000 gallons.
  2. Add 8 lbs of pH Decreaser (Sodium Bisulfate) per 5,000 gallons.
  3. Check Total Alkalinity to be sure it’s at zero; if not add more pH Decreaser.
  4. Brush pool several times per day, with a steel pool brush, Test water each day.

How do I remove stains from the bottom of my pool?

A super simple way to get rid of most organic pool stains is to shock the pool and give your pool a little TLC with a good brushing. This ‘bleaching’ removes most organic stains in concrete pools. Sprinkle granular chlorine shock right over an organic stain to make it disappear instantly.

How do I get rid of brown stains in my pool?

A good rule of thumb is to use half a pound of ascorbic acid per 10,000 gallons of water in the pool. If the stain was caused by metal, the scrubbing would remove or at least lighten the stain. If the stains are still visible, add more ascorbic acid. Repeat this process until the stains are gone.

What causes brown stains in swimming pools?

In this instance, brown pool stains can have one of a few causes: algae, metal, or dirt buildup. … And brown stains concentrated on the bottom can likely be attributed to dirt stains, typically enhanced by calcium buildup. The first step to deal with organic materials is to shock your pool, and scrub it.

How do you get stains out of a white plaster pool?

For extreme staining or serious algae blooms, plaster pools can be cleaned with an acid wash with muriatic acid, or the safer to use Acid Magic. Acid washing removes a thin layer of plaster, exposing bright white and unstained plaster underneath. Having your pool acid washed will remove most surface stains.

Can you clean a pool without draining it?

Although you can clean a pool without draining it, there are specific instances where draining your pool IS necessary. If your pool needs a repair that can’t be done with water still in the pool, then you need to drain it only with the approval or supervision of a pool professional.

How do you treat a stained pool?

Simply add one bottle (2 lbs.)of Pool Stain Treat per 20,000 gallons to your pool in the affected area and watch the stains disappear. Pool Stain Treat continues to work for up to sixty days keeping metals water soluble and preventing future stains.

How do you get brown stains out of a fiberglass pool?

  1. Remove oily stains from the water line with non-abrasive household tile cleaner applied with a soft cloth or sponge. …
  2. Eliminate brown stains caused by iron by scrubbing the area with a chlorine tablet.
How do you remove rust stains from fiberglass pool steps?

Most rust stains can be removed by rubbing a large Vitamin C tablet over the surface. You can also put 20 or 30 in a heavy ziplock bag and hammer them into a powder, and sprinkle the powder over a rust stain, followed by vigorous brushing.

Article first time published on

Can you use a magic eraser on a fiberglass pool?

To take things further, Nannini emailed the manufacturer about using Magic Erasers in swimming pools and the company replied by saying, “The answer to your question is no, we have not tested the products in pools, and the chlorine may react or interfere with the ingredients in the product.”

How do you use essential values stain remover?

For Surface Stains: Add 1 LBS or 1 use (half bottle) per 10,000 gallons to stained area(s) OR. For Water Discoloration: Set pool to recirculate mode, & add 1 LBS or Half Bottle per 10,000 gallons around the edge of the pool. Brush the pool walls & floor thoroughly, along with area that was treated.

Will citric acid remove pool stains?

Citric acid removes the stained area of a pool when applied by eating away the top layer of the pool’s surface. … Citric acid is a gentler stain remover than muriatic acid, another form of acid used to remove stains and resurface swimming pool interiors.

What is causing rust stains in my pool?

Most rust stains in swimming pools are caused by metal objects that have fallen into the pool. These include hairpins, nails, toys or grinding or cutting of metal near the pool. When metal objects are immersed in saltwater, they begin to rust and stain the pool surface within a few days.

What does baking soda do to pool water?

Baking soda, also known as sodium bicarbonate is naturally alkaline, with a pH of 8. When you add baking soda to your pool water, you will raise both the pH and the alkalinity, improving stability and clarity. Many commercial pool products for raising alkalinity utilize baking soda as their main active ingredient.

Can you use bleach for pool?

The solution to maintaining a clear pool is to use readily available liquid bleach as your chlorine source. … Daily adjustment of bleach to your pool water will result in a relatively constant level of active sanitizing chlorine that will be cheaper and easier to maintain over time.

How long does it take for a magic eraser to clean pool?

With this method, Pack says that the eraser should absorb the excess green hue and make the water look crystal clear once again—well within 24 hours. That means in the time it takes to make a no-bake cheesecake or churn and freeze a batch of homemade ice cream, your pool will look as good as new.

How do you get metal stains out of a fiberglass pool?

To remove rust or iron in a fiberglass swimming pool, you just need to add a CuLator Ultra 4.0 into your pump basket and let it work all summer. If you are using well water to top off your pool, then add a maintenance dose of Metal Sequester to the water when you are topping off.

Why does my fiberglass pool have rust spots?

When the fiberglass gel coat becomes compromised, pool water can react with the cobalt in the resin and causes it to oxidize. This is the black spot you would see as a spot deep in the resin and not raised above the surface.

Why is my fiberglass pool turning brown?

Causes of Inorganic Stains in a Fiberglass Pool A Brown or yellow stain indicates the presence of iron, and a black stain is caused by Magnesium. Iron stains will always appear yellow on fiberglass pool walls and steps.