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Pool Clarifier FAQs



Beach Ball Is there anything else I can use besides a pool clarifier? [open]
At, we carry a flocculant or pool floc. Much like a clarifier, pool floc works by collecting smaller particles and forming them into bigger ones, but they do not get filtered out. Instead they sink to the bottom and need to be vacuumed out manually.

While flocculants work faster, they are more hands on. You also can’t use them if you have a cartridge filter — unless you are able to bypass your filter while vacuuming. Floc works well with sand filters and DE filters. Floc is more work than a clarifier and you will lose some water due to the vacuum but it has the ability to clear your cloudy water in one to two days. Be sure to vacuum slowly to prevent stirring up the particles, and vacuum your pool more than once to ensure you picked up all of the particles. [Shop Pool Floc]
Beach Ball How much clarifier should I use? [open]
You’ll want to follow the instructions for the clarifier you get. It will give you a specific dosage based on your pool’s water capacity, in gallons.

If you don’t already know your pool’s capacity, you’ll need to find the volume of your pool. Here’s a quick formula you can use:

Length x Width x Average Depth x Multiplier = Volume in Gallons
  • The multiplier for rectangular and square pools is 7.5
  • The multiplier for oval pools is 6.7
  • The multiplier for round pools is 5.9
Note: All measurements should be in feet, including the depth. For above ground pools, assume that the water depth is 6” less than the wall height, so if your pool is 48”, assume the depth is 3.5’, and for a 52” pool, use 4’.

If math isn’t for you, take a look of the chart below featuring common pool sizes and how many gallons of water each size holds.

For more help with calculating your pool size, visit our blog, How to Calculate the Number of Gallons in Your Pool.
Beach Ball When should I use a pool clarifier? [open]
Whenever you’re facing cloudy water, you should look into using a clarifier. It is recommended to use clarifier when opening your pool as well. You want to do this once you’ve determined what is causing your cloudy water — this could be improper levels of chlorine, a clogged filter, imbalanced pH and alkalinity or one of several other things. You’ll also want to have your pool’s water chemistry properly balanced.

Clarifier should be used once a week if needed, the filter should also be continuously running while you treat your pool. Too much clarifier can result in murky water and bacteria growth so make sure to properly measure your chemicals. [Shop All Clarifiers]

Swimming Pool Buyers Guide CLARIFIERS

Using a pool clarifier is a tried and true way to clear your pool and is good to use weekly to prevent cloudy water from occurring in the first place.

Clarifiers work by gathering small particles that are clouding your water. The small particles then form into bigger particles that are able to be filtered out. You should have clear water in a few days after adding clarifier.

Afterwards, you’ll need to clean your filter. It’s also important to note that before you add a clarifier, you’ll want to determine what is causing your cloudy water, otherwise your freshly clear water will become cloudy once more.
More Questions?
If you have more questions about purchasing a clarifier or need help determining what chemicals you and your pool need, call our in-house pool experts at 1-800-356-3025.