What is a brown sandlike substance that on the bottom of pool - even after vacuuming it returns within an hour or so we have tried algae killing chemicals and everything help?

The brown sandlike substance on the bottom of your pool is likely a build-up of organic matter, such as dirt, leaves, and other debris. This organic matter can come from a variety of sources, including the environment, swimmers, and pool equipment.

When this organic matter breaks down, it releases nutrients into the water, which can feed algae growth. Algae can also contribute to the formation of brown sandlike substances. When algae die, it sinks to the bottom of the pool and decomposes, releasing more nutrients into the water.

To prevent the build-up of brown sandlike substances, it is important to keep your pool clean and free of debris. This can be done by regularly vacuuming the pool and removing leaves and other debris from the surface of the water. It is also important to keep the pool covered when not in use to prevent debris from entering the pool.

In addition to keeping the pool clean, it is also important to maintain proper water chemistry. This includes keeping the pH level between 7.2 and 7.8, the chlorine level between 1 and 3 ppm, and the alkalinity level between 80 and 120 ppm.

If you have tried all of these things and you are still experiencing a build-up of brown sandlike substances, it is possible that you have a more serious problem, such as a plumbing leak or a filtration system malfunction. In this case, it is important to contact a pool professional to have the problem diagnosed and repaired.

Here are some specific steps you can take to try to remove brown sandlike substances from your pool:

* Vacuum the pool thoroughly, paying special attention to the areas where the brown sandlike substance is accumulating.

* Use a pool brush to scrub the sides and bottom of the pool.

* Backwash the pool filter.

* Add a clarifier to the pool water. This will help to clump together the brown sandlike substance so that it can be more easily removed by the filter.

* If the brown sandlike substance is still present, you may need to shock the pool. This will kill any algae that may be present and help to break down the organic matter.

* Repeat steps 1-6 as necessary until the brown sandlike substance has been removed.

If you are still experiencing problems with brown sandlike substances in your pool, it is important to contact a pool professional for assistance.