Quote Originally Posted by hobogato View Post
i agree, two 1" drains can handle a mag 18. however, it leaves little room for problems. one of those drains alone will not be able to handle all of the flow should a snail or something else cause a blockage. as long as you can be sure to keep stuff out of the drains, you should be fine.
would you suggest to use a return pump that matches the flow of one of the drains as extra insurance rather than max it out by relying on both then?