Sand Filters

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When should you change the sand in a sand filter?

Some of our viewers wonder how often the sand should be changed in their sand filter. The Pool Guy has recommendations for you: change the sand in a sand filter when your system tells you it’s time through your water clairty and its ability to clean the pool, or if it’s been more than 3-5 years since it was changed or when you can see the signs in the sand.

How often should I backwash a sand filter?

How often should I backwash a swimming pool?
Hayward Equipment with a Top-Mount Multiport and Sand Filter

Hayward Equipment with a Top-Mount Multiport and Sand Filter

You should backwash a swimming pool filtration system (sand or de) when the pool system needs it. You will be able to tell it is time by a number of factors..

When the system doesn’t run as well as it had been, ie it is slower to push water through, the skimmer is not suctioning as well as it should be, the returns are slow, or the pump is getting air into the system
When the pressure gauge is running 5-7psi above it’s normal operating level
when the pool is turning cloudy, and just doesn’t seem to be filtering effectively

On our new construction projects, it is common to backwash weekly when there is a lot of dirt and debris flying around. Once the pool is installed and normal maintenance is performed, once every couple of weeks would be the norm. Of course your situation will vary depending on your environment, number of trees, amount of debris, use of the pool etc.

How much sand should be in my sand filter?

Filter Sand Quick Reference Guide

Filter Model Sand Zeolite
Hayward GM 140 40 lbs filter sand 20 lbs Zeolite
Hayward GM 142 50 lbs filter sand 25 lbs Zeolite
Hayward GM 152 50 lbs filter sand 25 lbs Zeolite
Hayward S140T 50 lbs filter sand 25 lbs Zeolite
Hayward S144T 50 lbs filter sand 25 lbs Zeolite
Hayward S160T 150 lbs filter sand 75 lbs Zeolite
Hayward S164/S166T 100 lbs filter sand 50 lbs Zeolite
Hayward S180T 150 lbs filter sand 75 lbs Zeolite
Hayward S190T/GM195 175 lbs filter sand 88 lbs Zeolite
Hayward S200 200 lbs filter sand 100 lbs Zeolite
Hayward S210S 200 lbs filter sand 100 lbs Zeolite
Hayward S220S/S220T 250 lbs filter sand 125 lbs Zeolite
Hayward S245T 300 lbs filter sand 150 lbs Zeolite
Hayward GM225 200 lbs filter sand 100 lbs Zeolite
Hayward GM245 200 lbs filter sand 100 lbs Zeolite
Hayward S240 300 lbs filter sand 150 lbs Zeolite
Hayward S244S/S244T 300 lbs filter sand 150 lbs Zeolite
Hayward S300T 500 lbs filter sand 250 lbs Zeolite

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