I have a de filter and for some reason I have sand in my pool. Where could the sand be coming from
The picture you have here is for a sand filter not de.
If this is the correct filter pictured, the seal on the valve is probably defective, usually due to moving the lever for backwashing while the pump is running.So it is sand that's passing through.
Find the model number of the valve, go to your pool supply store such as pinch a penny and buy a new rubber seal. If you want you can remove the 6 or 8 screws on top of the valve and take the seal out and take it with you to match with the new one. (just make sure you turn off all power to the pump so it doesn't start off the timer while you're working and be careful not to drop your screws inside the tank)
Good Luck
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