Why did my filter start leaking right after I backwashed it?

syedsam

syedsam

Member
I did a backwash this morning and when I turned the system back on there was water dripping from the side of the filter tank. It never leaked before and I didn’t change anything else. Did I mess something up during the backwash or could the tank have cracked?
 
This happened to me once and it turned out the multiport valve gasket slipped a little when I switched it back to filter. I shut everything off, reseated the handle, and it stopped leaking. If the drip is from the tank itself that might be a bigger issue, but most of the time it’s just a seal or O-ring after backwashing.
 
This happens sometimes! I had the same issue once, and it turned out the gasket wasn't seated properly after the backwash. Might want to check the seal again, could be the issue!
 
I’ve had this after a backwash too. Power off, pull the lid/multiport, clean and reseat the O-ring or gasket, add a little lube, then tighten the clamp and start it back up. If it still drips or it’s coming from the tank body, it could be a crack stop and have it checked.
 
It looks like the issue might be with the gasket or O-ring. After backwashing, sometimes the gasket or O-ring doesn’t seat properly. Try cleaning and reseating the gasket or O-ring, add a little lube, then tighten it up again. If it still leaks, there might be a crack in the tank that needs to be checked.
 
This could be due to the gasket or O-ring not seating properly after the backwash. Try cleaning and reseating the gasket or O-ring, adding a little lube, and tightening it again. If it still leaks, there might be a crack in the tank that needs to be checked.
 
Manikshaw said:
This happened to me once and it turned out the multiport valve gasket slipped a little when I switched it back to filter. I shut everything off, reseated the handle, and it stopped leaking. If the drip is from the tank itself that might be a bigger issue, but most of the time it’s just a seal or O-ring after backwashing.
Click to expand...
I agree with Manikshaw on the gasket, but here’s a quick check people miss, make sure the multiport handle fully “clicks” into the filter position before the pump starts, because if it’s sitting slightly between positions the pressure can push water out near the clamp even if the tank isn’t cracked. I shut the pump off, move the handle firmly while pressing down, restart, then wipe everything dry to see if the drip is from the multiport seam or the tank seam, and it usually becomes obvious within 5 minutes. Does it only drip when the pump is running, or does it keep dripping even when it’s off?
 
I’d like to add to what Manikshaw mentioned. In my case, a small leak showed up because of a pressure surge when I restarted the pump right after backwashing without bleeding the air first. Trapped air inside the tank prevented the seal from seating properly. Once I made it a habit to open the air relief and let the flow stabilize before full pressure, the dripping stopped. It’s not always a crack, sometimes it’s just the startup sequence.
Manikshaw said:
This happened to me once and it turned out the multiport valve gasket slipped a little when I switched it back to filter. I shut everything off, reseated the handle, and it stopped leaking. If the drip is from the tank itself that might be a bigger issue, but most of the time it’s just a seal or O-ring after backwashing.
Click to expand...
 
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