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Old 03-03-2009, 06:51 PM   #21
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What are the advantages of having a drilled sump? Is it because of the external pumps being better? Is it a hard piping thing? Not sure if I want to drill my sump. Seems like most are drilled though. Just a cleaner set up?
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Old 03-03-2009, 06:56 PM   #22
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Mine's not. Some worry about heat generated from the submersible pump. Never really paid that much attention. I was after cheap, and a used tank and a sub-pump fit the bill nicely
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Old 03-03-2009, 11:29 PM   #23
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What about the positioning of the two holes? (Drain and return)? One above the other? Are the holes the same size? I thought I read somewhere that the return is a little smaller.

Does this have anything to do with the capacity of the return pump?

Thanks again Captain. I just joined this site and have learned more today than I have in the last year. lol
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Old 03-04-2009, 03:51 PM   #24
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I also use submersible pumps for my returns. My sump is not drilled.

I skimmed over the responses and questions you have asked, I would not suggest drilling a hole in the tank for your return line. I understand you wanting to have everything nice and neat but keep in mind that the return will back siphon water when the pump is off.

As long as you match the pump flow to the drain you will be fine on water flow. A 1" bulkhead can handle about 600gph via 1" PVC. I would think a Mag7 would work just fine as your return pump.
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Old 03-04-2009, 04:35 PM   #25
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Thanks Ziggy.

Your point regarding the siphon factor for the return lines is true. In my head I had pretty much settled on having three holes drilled. I wanted my internal overflow box along the back wall in the middle. (The height of the tank). Then I was going to have 2 return lines, one in each upper corner. I like that idea of flow in the tank.

How do people get around siphoning return lines? Would it be a different story if I had the return also drilled in the overflow box area??
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Old 03-04-2009, 04:44 PM   #26
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a simple check valve

A return in the box area will only back siphon as deep as the return head is located. All that should be figured into the sump design to handle for the possibility
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Old 03-04-2009, 05:51 PM   #27
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Hi Captain,

Do many people use check valves in there return lines? I would think everybody would but it sounds like everyone just leaves for the return lines drain to the sump. Why not have a check valve or one way valve that only lets the water flow to the tank and not the sump? Does this pose an issue for the return pump? Do these valves cause more blockages? Are there disadvantages to a one way valve other than cost?

Thanks
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Old 03-04-2009, 05:57 PM   #28
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Check valves can fail. If something gets sucked into the pump it could get stuck in the valve and then you have defeated the purpose. My return lines go over the top of the tank and I have two holes drilled just above the water line to break siphon if the power goes out. This has worked very well for me and it is how many other folks prevent a flood.

I don't like putting faith in a valve that could fail and cause problems. What ever you do you need to make sure that your sump can handle the back flow when your pumps are shut off.
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Old 03-04-2009, 06:06 PM   #29
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Good point Ziggy. Perhaps not having a drilled hole for my return line would be alright. I like the fact that it can siphon back. Do you use hard piping or soft stuff for this?

If I was just to get one hole drilled for drain that wasn't on the bottom, where would you suggest to be a good spot? And where would you have it return to?
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Old 03-04-2009, 06:10 PM   #30
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Either way Zigg's, it's still only going to siphon down the the water level of the return nozzle.
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