What causes slime and bubbles in a pool that recently had shock treatment the sand was changed last month?

There are a few possible causes for slime and bubbles in a pool that recently had shock treatment and a sand change.

* Inadequate chlorine levels. Chlorine is a disinfectant that kills bacteria and other microorganisms that can cause slime and bubbles. If the chlorine level in your pool is too low, it can allow these microorganisms to grow and multiply.

* High pH levels. High pH levels can make chlorine less effective at killing bacteria. If the pH level in your pool is too high, it can also cause the water to become cloudy and scale to form on the pool surfaces.

* Organic contaminants. Organic contaminants, such as dirt, leaves, and body oils, can provide food for bacteria and other microorganisms. If there are too many organic contaminants in your pool, it can cause the water to become cloudy and slimy.

* Poor circulation. Poor circulation can prevent the chlorine from reaching all areas of the pool. This can allow bacteria and other microorganisms to grow in areas where the water is not circulating properly.

To resolve the problem of slime and bubbles in your pool, you should:

* Check the chlorine level. The chlorine level in your pool should be between 1 and 3 ppm. If the chlorine level is too low, you should add chlorine shock treatment to the pool.

* Check the pH level. The pH level in your pool should be between 7.2 and 7.8. If the pH level is too high, you should add pH reducer to the pool.

* Remove organic contaminants. You should regularly skim the pool surface to remove dirt, leaves, and other organic contaminants. You should also vacuum the pool bottom once a week to remove any settled dirt or debris.

* Improve circulation. You should make sure that the pool pump is running for at least 8 hours per day. You should also open the pool valves to allow the water to circulate freely.

If you have tried all of the above steps and you are still experiencing problems with slime and bubbles in your pool, you should contact a pool professional.