Yeah, having had a few check valves fail on me, I don't trust them anymore either. Indeed, what's the point. They work to a point but I guess eventually the slime buildup inside the pipes gets to be too much to form a seal or maybe the spring starts to corrode.
Another idea with locline is just have the nozzles exhaust near the water surface. This is what I do on my tanks. (And then just have enough flow inside the tank to mix it up.) That way there's no siphon hole to get clogged. On one tank I had vermetid snails and valonia growing over my siphon holes on a weekly basis, I grew weary of constantly scraping them clean every couple of days, so I just pulled the whole manifold out and replaced it with locline outputs.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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