Bidirectional tidal flow

[sphelps]

I should also point out that even with a cheap DIY mod the cost of adding the OM isn't much different than adding an additional pump. In order to accomplish this specific flow pattern I fail to see the advantage of adding something that requires more maintenance, adds more flow restriction and has less reliability. The OMs work great to simply alternate flow between a few outputs but in this specific case it's far from ideal.