I am not quite get what you mean ? - But I think you mean where does the hose enter to tank for return line. my tank is custom design. I sketched it myself with return right on the backwall 2/3 uptop, not up to the air and back in water like many other tank. Thanks

You mean 1.5 inch ? - My pipe is only 1/2 inch. But thanks for the helps.
I also agree with you about equipments' failure. And even if it might fail due to dirty clogging, we can prevent by cleaning it thouogh.

power head craps out no big deal, flood my basement with salt water if a valve failed...

Not all applications of a check valve are as all dire as all that though. I needed a check valve because otherwise my zeovit reactor would dry out in the off periods as the rocks were higher than the waterline in my sump. Although having said that all I did was buy the check valve and then never installed it, and just ran the zeovit reactor 24/7. Ooops.

Although I agree, I'd rather have a sump return line without a check valve. It's just asking for trouble sooner or later. My favourite sump return setup involves having locline right at the surface - no siphon hole no check valve no sump overflows.

I had a tank with a similar design and what I did was to use Loc Line from the return bulkhead and bent the loc line in a shape that brought the spout closer to the water surface, so as soon as the water dropped slightly the spout of the loc line would get air to break the siphon.


This will be a much better option for you, if you have a pump failure 1/3 of your tank would siphon out, which would leave 2/3s baking under your lights.

[quote=jpdutton;340890] ... to use Loc Line from the return bulkhead and bent the loc line in a shape that brought the spout closer to the water surface, so as soon as the water dropped slightly the spout of the loc line would get air to break the siphon.QUOTE]

Nice thought.
As you are the third person who suggested me doing that, I think I'll make some modification to my system soon. Thanks :lol:
I agree with the thought: Less worries is more enjoyable !

Thanks,