How Do I Stop Sand Going Back Into The Pool..Pool Keeps Getting Dirty..
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Have a sand filter. About 4 years old as is pool. Lately I've noticed that after my automatic pool cleaner completely cleans the bottom and the skimmer has cleaned the surface, the next day the pool has dirt in the bottom.
This is without us even using the pool. Seeing a new leaf or bug, or whatever floating in the bottom is normal after the pool sitting overnight, but dirt in the bottom leads me to believe my filter is not working properly.
I backwash/rinse and the problem remains. Is it time to change the sand?
Thanks for the question Rod
This problem faces alot of sand filters. About 95% of the time when dirt/debris returns to the pool it's these:
1. Broken lateral and/or diffuser
3. New sand
4. Old sand
5. Not doing the RINSE after backwashing
A broken lateral means that the dirt is not being captured in the sand. The dirt returns back to the pool through the returns. For a broken lateral you need to scoop out the sand, replace the lateral, then replace the sand.
It's manual labor, but if you can screw in a light bulb you can replace a lateral. Channeling is when the sand becomes clogged with debris and oil. Water inside the filter finds its way down the sides of the filter and returns as unfiltered water.
An easy way to check this is to unscrew the
top of the filter. Obviously turn off the filter first and release the pressure. Feel around the inside sides of the filter for pits, edges, holes, etc... Squeeze the sand together. If it sticks like sandy Crisco, you have have channeling. You'll need to degrease the filter.
If you do have this problem you can email back and I'll walk you through an easy way to do this. New sand has alot of finer particles that pass through the filter and back into the pool. This will decrease as the sand settles down.
Old sand is when the sand becomes very smooth and smaller. The filtration is not as good and that allow dirt back to the pool. Don't backwash too frequently. You'll waste too much water and a little sand get taken away each time. If you do put new sand in be sure to put the correct number of pounds in and get the correct size sand for your filter.
Also check what's called "freeboard". This is the measurement from the top of the tank to the sand. You can call the sand filter manufacturer and get the correct measurements.
RINSE setting on the Multiport valve after backwashing. Dirt and sand gets trapped in the lines after a backwash. If you don't RINSE afterwards the dirt goes back into the pool. About 30 seconds is all you need.
Hope this helps and have a great swimming season