Cover keeps sagging and collecting water in the middle

syedsam

syedsam

Member
Closed my pool last week and already the cover has a big puddle in the middle pulling it down is this normal or did I set it up wrong.
 
You can also just run a small cover pump after every rain I set mine up automatically so the puddle never gets too heavy and stretches the cover.
 
That happens to me every year unless I use a pool pillow under the cover it pushes the water out to the edges instead of pooling in the middle.
 
I use an air pillow in the middle and a small cover pump after rain. Pull the straps/edges snug too since then the water runs to the edges and no more sagging.
 
A little dip can be normal at first, but if it’s turning into a deep bowl, it’s usually a support issue rather than a bad cover. One thing worth checking is the water level underneath. If the pool water is too low after closing, there’s nothing pushing back up against the cover, so it naturally sags toward the center.

Another overlooked factor is debris underneath the cover. Leaves or sticks left floating before closing can create low spots that encourage water to collect in one area instead of spreading out evenly. Over time, that extra weight stretches the fabric and makes the sag worse.

If you correct the water level and make sure the surface underneath is clean and even, the cover usually sits much flatter. It doesn’t have to be drum-tight, just supported enough that water doesn’t keep finding the same low point every time it rains.
 
A puddle in the middle of the cover can happen if rain or snow collects on top. If the cover isn't tight enough or has a low spot, water can gather there. I usually make sure the cover is well secured and pulled tightly to prevent pooling. If the issue continues, I’d check the drainage system and make sure there are no leaks.
 
Manikshaw said:
You can also just run a small cover pump after every rain I set mine up automatically so the puddle never gets too heavy and stretches the cover.
Click to expand...
Reading what Matthew Collins explained about support underneath, that makes a lot of sense to me. I once lowered my water level too much before closing, and the cover had no support so it instantly formed a bowl after every rain. Once I kept the water slightly higher and made sure there wasn’t debris floating underneath before covering, the sagging improved a lot. So in my experience it’s more about setup and support, not necessarily that your cover is bad.
 
A small puddle in the middle after rain can be pretty normal, but if it’s turning into a deep “bowl” that pulls the cover down, it’s usually a support issue under the cover or the pool water level was lowered too far so the cover isn’t supported from below. Matthew Collins is on the right track: I’d first check the water level, then add a center support to help water run to the edges, and snug up the straps/edges so it isn’t slack; then watch what happens after the next rain, because letting a heavy puddle sit can stretch the cover and make the sagging worse.
 
I dealt with the same thing my first winter and thought the cover was defective. Turned out it was more about tension and support than the cover itself. If the cover has even a small low point, rainwater will keep finding that same spot and eventually it turns into a bowl.

One thing that helped mine was tightening the cover evenly around the perimeter so it had a little slope instead of sitting flat. Once the edges were snug, most rain started running toward the sides instead of collecting in the middle. I also kept an eye on the pool water level underneath because if it drops too far after closing, the cover loses that upward support and sagging gets worse.

Filtration and cleanup before closing matters too. Leaves or debris floating underneath can create soft spots that encourage water to pool above them. When the water surface underneath is clean and the cover is evenly tensioned, it usually sits much flatter.

Even with a good setup I still get a little puddle after a big rain, but keeping the weight off the cover helps prevent it from stretching over the season. Anyone else notice the sag gets worse once the pool water level drops a few inches during winter?
 
One thing I didnt see mentioned yet is the springs/anchors around the perimeter if you’re using a safety cover. After a season or two they can loosen a bit and the cover slowly loses its pitch, so rain keeps finding that same low point. I had that happen on mine and the middle kept turning into a little lake even though the water level under the cover was fine. I went around with the installation tool and gave the springs another half turn so the tension was more even, and it helped the cover shed water toward the edges again.

Also worth watching how the cover sits after the first couple freeze/thaw cycles. The fabric stretches a tiny bit once it gets wet and cold, and if the anchors arent balanced the sag shows up fast. Mine looked perfect the day I closed, then two rains later it had a dip. Tightened the anchors evenly and it stopped getting worse. Still get a small puddle sometimes but nothing like that big bowl effect. Anyone else notice the cover stretch a bit after the first cold snap?
 
Coming back to this thread because I just dealt with the same exact thing this spring. Finally broke down and bought one of those automatic cover pumps that kicks on when it detects water. Best $50 I ever spent on pool stuff. Set it on the cover in October and forget about it until spring.

The manual pumps work fine but you have to remember to go out there after every rain and plug it in. With the automatic one its just done for you.
 
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