Personally I'd skip the check valve... your sump should have enough room to handle any overflow that will come down. Check valves add another layer of maintenance which can be really difficult as they usually are placed in difficult spots to access. If the aren't maintained regularly they fail, even if you do maintain them they can still fail, if you look at them funny, they can fail (Joking on that last part, Kinda...).
Alot of arguements are made they are nice to have as a backup, but if your sump is big enough to hold all the water that will drain down. Well then there really isn't a need for a backup. The only arguement worth really entertaining atleast IMO is they can maintain the level in your sump to keep the skimmer from freaking out with the change in water height.
Alot of arguements are made they are nice to have as a backup, but if your sump is big enough to hold all the water that will drain down. Well then there really isn't a need for a backup. The only arguement worth really entertaining atleast IMO is they can maintain the level in your sump to keep the skimmer from freaking out with the change in water height.
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