How To Remove Yellow Stains From A Pool Liner – Complete Guide

Have you noticed yellow stains on your liner, and more exactly a yellow coloration of your water line? How to avoid these spots? How to get rid of it?

The water line of a swimming pool is a very sensitive area (especially when it is equipped with a liner). This is where most of the pollution is concentrated, resulting in a brown or yellow coloration of the water line.

The fouling of the water line of the swimming pool is slow and regular. It is caused by fatty substances floating on the surface of the swimming pool, including, in particular: the fallout from the combustion of hydrocarbons (chimneys, proximity to a road or an airport, etc.), body oils and pollution linked to the plant environment.

It is frequently observed that the water line is more easily marked on the sides of the swimming pool, exposed to the sun . In fact, the pollution of the membrane is activated or aggravated by solar radiation.

A yellowish coloration on the water line of your swimming pool may appear.

This coloring results from an undesirable chemical reaction between certain anti-UV agents incorporated in sun products (such as Benzotriazine and Benzotriazole) and the presence of copper in the swimming pool water.

This coloring is limited to the water line (emerged part of the liner) because it is on the surface of the pool that the sun creams and oils, which are insoluble in water, float.

Products That Will Clean The Yellow Stains

  • Regular maintenance of the liner water line

The coloring of the water line is easily removed by a weekly maintenance , using a liquid, non-abrasive cleaning product (varnished membranes), provided for this purpose.

You can also use a magic eraser to scrub your water line.

  • Beware of limestone on the walls of your pool

The lime deposits on the water line of your swimming pool facilitate the adhesion of fatty substances and complicates its cleaning.

Lime is easily removed by using a suitable acidic cleaning product 

It is also possible to use a mixture of isopropyl alcohol and water (1/1). Very stubborn pollution is generally removed with ethyl acetate or THF, but these modify the appearance of the surface (shine) and also remove the varnish and the pattern, in the case of a coating printed or varnished. The use of ethyl acetate, THF or, more generally, PVC solvent, is therefore strictly prohibited with varnished and / or printed membranes.

  • Watch out for copper and sunscreen in your pool

Avoid an excess of sunscreen and especially sun oil (the worst!) And take a shower before swimming.

Avoid adding copper to your pool (copper sulfate).

How To Eliminate The Yellow Stained Water Line For Good

In order to remove the yellow stains on the liner or the PVC membrane, the following curative treatment must be carried out:

1st week:

1- Increase the water level of the pool to cover the stained area

Day 1 :

2- Perform shock chlorination at 10 ppm of free chlorine

3- Adjust the pH of your water to 7

4- Pour into a skimmer 1 cap (40 ml) of metal inhibitor (FERAFLOC) for every 50 m³ of water

Day 4:

5- Pour a new dose of 40 ml of FERAFLOC for every 50 m³ of water

Day 7:

6- Backwash the filter

NB : Let the filtration run continuously, throughout the treatment and repeat the above operations for 5 weeks.

How To Clean A Swimming Pool Liner

Over time, a pool liner gets old, discolored, get dirty … To keep it in good condition for a few more years, you can easily clean it. 

Why Maintain the Liner of Pool

The pool liner is one of the most important parts of a swimming pool. If it is dirty, the color of the water may change. And over time, the liner can quickly get dirty due to the natural elements that can fall into the water (leaves, dirty rainwater, pollen, etc.), and through heavy use of the pool.

A swimming pool liner has an average lifespan of 10 to 15 years. It is important to ensure that it remains clean during all these years:

  • By making sure to maintain a good water balance (pH level, disinfectant level)
  • Be careful not to dirty it: avoid swimming after having spread tanning oil on the body for example or, even, avoid throwing things in the swimming pool.
  • By acting quickly when traces appear on the liner.

Tips for Cleaning the Pool Liner

There are liner cleaners, products specially developed to remove stains and traces of dirt on a liner. Just apply the product on a sponge, or with a cleaning glove, and rub. The idea is to proceed in a circular fashion: make circles by rubbing. This will absorb dirt particles without damaging the liner.

Other tips on how to clean the liner:

  • You can clean your pool with a  magic eraser, a white sponge, and rub the liner with a little water. It removes the most stubborn traces, without even using a cleaning product.
  • There is also what is called the silver stone. This is a clay-based, biodegradable solution. You just need to impregnate the silver stone with a sponge and rub on the traces.
  • You can finally use white vinegar. With a sponge and a little elbow grease, you can easily remove all traces on the liner.
  • To remove stains related to the presence of algae in the water, you can use a chlorine tablet (with gloves!) Or carry out a shock treatment with chlorine.