Cloudy Water

What Causes Cloudy Water?

It’s always disappointing to uncover your pool to find that your water is cloudy. There are a few different reasons why it may be cloudy:

  • Algae bloom
  • Filtration issue
  • Small, suspended particles
  • Chemicals

What may be causing the cloudiness in your water depends on several different factors. Learn more below!

Clearing Up Your Water

The method that you need to use to clear your water depends on what’s causing the cloudiness. Go through these possible causes to troubleshoot the water and learn how to clear it up.

Algae Bloom

Oftentimes, cloudy water indicates the beginning of an algae bloom. This is most likely caused by persistently low chlorine levels in your pool.

To solve this issue, you need to chlorinate your water. First, add chlorine pucks to your skimmer (or turn up your chlorine generator), then shock the water with Aqua Super Shock.

It may take several days to clear up after shocking the water.

Filtration Issue

If your water is holding a steady chlorine level and is still cloudy, you may have a filtration issue.

The first thing to check is the cleanliness of your filters. If you have a sand filter, backwash it and add Aqua Filter Free to clean it out. If you have cartridge filters, pressure wash them on an angle.

Take note of the age of your filters. Sand and cartridges need to be replaced every several years for them to work effectively.

Small Particles

If your chlorine has a steady hold and your filters are clean, there may be tiny particles in the water that are making it cloudy. Since these particles are so small, the filters may not be able to pick them up.

In this case, you’ll need to add a clarifier, such as Aqua Super Clarifier. This product will coagulate the particles so they become large enough for the filters to pick up.


If you notice that cloudiness has appeared soon after you added chemicals to your water, it is most likely the chemicals have caused it.

Some chemicals, such as Aqua Super Shock and Aqua No Phos, can cause cloudiness, but it should become clear again within 24 hours.