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 Post subject: Pump Size Question
PostPosted: Feb 3rd, '18, 04:34 
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As far as pumps go. Is the rule of pumping the FT capacity every hour mean through the GB or can you just divert some back to the sump for aeration? I am looking at 300 gal. FT and 300 gal. of GB AND sump.The pump is 300 g/h. Obviously at that rate the GB would never have a chance to drain and get oxygen before refilling again. So if maybe I reroute some back to the FT or sump would that work? Throttling back the flow is out of the question as EVERY pump manufacture I talked to warned against doing that. SO if some went to the grow beds and the rest went back to the FT is that good? Any suggestions would be appreciated and welcomed.

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 Post subject: Re: Pump Size Question
PostPosted: Feb 3rd, '18, 07:30 
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Your system will work fine, in fact that's a pretty small pump really and may be too small for what you need when you take into account that you'll have a head that you need to pump too, reducing the flow of the pump. An 1100/1200L/h (converted) pump is tiny, in a system that size I wold be happy using a pump 2 or 3 times the size of that.

How are you designing your system flow, siphon or timed pumping?

And so far as throttling back the pump? If it's a submersible pond pump, there are no problems throttling back the flow, the impeller just spins in the water, this is what happens as you increase the head, the impeller keeps spinning, but pushes less water up the pipe because it requires more work to push it up against gravity. I don't know what manufacturers/suppliers you've been talking too, but I think they might be full of it.. :)

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 Post subject: Re: Pump Size Question
PostPosted: Feb 3rd, '18, 14:30 
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Indeed as EB says, many purveyors of pumps appear to have no clue about how they work, and the effect of restricting flow being identical to pumping to a higher head for the type of pumps used in AP.
That cluelessness extends to the misguided notion that using a smaller pipe will allow the pump to pump water to a higher head.

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 Post subject: Re: Pump Size Question
PostPosted: Feb 6th, '18, 03:36 
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I will be using one of those Jabao pumps with a head of approx. 1 meter. It will be a bell siphon system. I will not have the pump submerged, it will sit on the floor for easy access. :headbang:

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 Post subject: Re: Pump Size Question
PostPosted: Feb 6th, '18, 06:34 
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Most of the jebao pumps are submersible..

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 Post subject: Re: Pump Size Question
PostPosted: Feb 6th, '18, 10:33 
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This one is convertible. I would rather have it outside the tank.

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 Post subject: Re: Pump Size Question
PostPosted: Feb 9th, '18, 23:38 
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usmick78 wrote:
This one is convertible. I would rather have it outside the tank.


Is that going to be a problem? :?

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 Post subject: Re: Pump Size Question
PostPosted: Feb 11th, '18, 06:56 
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I'd say well over 90% of systems use a submersible pump in the water, why do you want it outside?

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 Post subject: Re: Pump Size Question
PostPosted: Feb 11th, '18, 07:53 
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Reduce electrical potential of shock?

I am currently running pump outside of my diy sieve and have no problem with it, (so long as the water is there to pull from.....)

The only negative I have encountered so far.

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 Post subject: Re: Pump Size Question
PostPosted: Feb 12th, '18, 08:27 
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For my setup, access to the pump will be easier. And BroHay also has a point about shock hazard. But the main reason is access. :thumbright:

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