Calicat, welcome to the forum!![]()
The solid covers are very heavy! As such they are a little harder to put on and take off. They are now making a tighter weave mesh cover (sunblock weave) which we started to install last fall - the results from 1 season (with a December in which the temps never got to freezing) are that they significantly reduce the formation of algae which is often seen with regular mesh covers. The solid covers are also harder to clean, dry, fold and store.
If you want the solid cover, I would get the on with the vents. My reasoning is that the water is constantly being removed from the cover. Water weight can stress the springs so much that they warp to the point that you can't even get the cover tool into them, necessitating replacement periodicly. Though a pump would allow you to keep a totally solid cover ~ water-free, any pump problems could leave you with a cover full of heavy water. (AS a note - the vents will leave you with a rectangle of fine debris directly underneath them in the spring which you'll have to vac up - but this is minor because you'll probably have to vac anyway because worms like to crawl under the cover and drown themselves)
Again, welcome to the forum!! - waste
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