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Old 06-15-2014, 06:07 PM   #31
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Read previous post first.

Basics: if there is air in your siphon after return pump turns off then you may loose siphon when pump goes back on.

If you have air in siphon after powerless you have one of 2 issues that you should resolve.

1) return pump or plumbing undersized.
2) leak in siphon tube. Via nipple if one exists.

Relying on an Aqualifter that can fail doesn't sound like a good idea to me. Better to fix the issue.
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Old 06-15-2014, 09:40 PM   #32
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Thanks so much Dav3. Since so many people were initially in doubt of your setup, we clearly have much to learn.

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Old 06-15-2014, 10:11 PM   #33
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Agreed Dave knows what's going on. I stumbled onto my set up but I have a feeling his is intentional
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Old 06-16-2014, 02:35 AM   #34
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There is no way siphon will start by itself without priming it first. Dav3 himself mentioned that he primed his overflow at first. So why remove the aqua lifter if you already have it? Why not just leave it there since there is no 100% guarantee that your overflow will be immune to bubbles?
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Old 06-16-2014, 02:53 AM   #35
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Quote:
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Again, just match pump flow after headloss to rated flow of overflow. Get as close as you can or go oversized a bit with the pump and just dial it back a bit.

Just need to keep the air bubbles from building in the tube. Get flow fast enough and it will flush any bubbles out.
I would rather have an over sized overflow box than under sized. If you miscalculate your flow by the gate valve at the return, guess what will happen? If the return is even just slightly more than your overflow you won't notice it and one day when you come home you will find your DT is flooding your floor.

Just remember in CPR overflow box the air pocket that is trapped due to accumulation of air bubbles always stays above the water flowing on the U chamber. Even if you have to set your DT level at max it will not remove that air pocket without using an aqua lifter.
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Old 06-16-2014, 09:53 AM   #36
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Quote:
Originally Posted by jeffaquarius View Post
There is no way siphon will start by itself without priming it first. Dav3 himself mentioned that he primed his overflow at first. So why remove the aqua lifter if you already have it? Why not just leave it there since there is no 100% guarantee that your overflow will be immune to bubbles?
Well yes you have to prime it once. But that is all.
With a properly configured system the siphon will remain primed when the power goes out.

There is no guarantee that the Aqualifter will work when you need it to.
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Old 06-16-2014, 09:56 AM   #37
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Quote:
Originally Posted by jeffaquarius View Post
I would rather have an over sized overflow box than under sized. If you miscalculate your flow by the gate valve at the return, guess what will happen? If the return is even just slightly more than your overflow you won't notice it and one day when you come home you will find your DT is flooding your floor. Just remember in CPR overflow box the air pocket that is trapped due to accumulation of air bubbles always stays above the water flowing on the U chamber. Even if you have to set your DT level at max it will not remove that air pocket without using an aqua lifter.
This is simple as well. Decrease flow with gate and them force a few air bubbles into the overflow if they stay in siphon section then flow to low. Slowly increase flow till the bubbles flush out.
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Old 06-16-2014, 10:00 AM   #38
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If you want to rely on a Aqualifter then that's fine. My point is it's not needed.
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Old 06-16-2014, 10:21 AM   #39
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My system has Been up 2 years and I have only needed the suck the air out the first day it was set up
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Old 06-16-2014, 07:12 PM   #40
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Quote:
Originally Posted by Dav3 View Post
Relying on an Aqualifter that can fail doesn't sound like a good idea to me. Better to fix the issue.
But an aqualifter is a good insurance policy.....Not necessarily to rely on, but to have as a fail safe.
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