When we had our pool installed in 2004, we opted for a mesh safety cover which I used for several years. While it is safe since water doesn't accumulate on it, it has some downsides that ultimately motivated me to switch to a solid cover (actually, I lay an inexpensive solid cover over the mesh cover).
For me the disadvantages are as follows:
1. Allows dirt through making spring cleanup more difficult
2. Since rainwater still gets into the pool, your winter chemicals get diluted making a green pool upon opening more likely. While you don't have to pump water off the mesh cover, you do have to keep and eye on the pool water level and pump out when necessary. Of course, letting water through is also what makes it a "safety cover".
3. Enough light gets through to allow algae blooms to occur. You have to wait to close very late in the year and open very early to avoid algae problems. Even then I've opened to a green pool sometimes. Since going with the solid cover, I've not had a single algae bloom even though I'm closing earlier (early Oct) and opening later (early May). As a matter of fact, a couple years ago in early May when I removed the cover we found the liner had pulled down from one side. We put the cover back on until we could get it fixed which wasn't until early June. Despite the water being warm, the water was still clear when we removed to cover for the repair.
Since going with the solid cover, spring cleanup is MUCH easier and I can close/open when I want. You just have to make sure you pump water off of it as it accumulates.
Hope this helps.
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