by Virgil
(Chicago, IL)

I love your site lots of information. I have a question about air and waterpumps.Do the air pumps come in different flow ratios as water pumps do? I did read what you had about selecting the right pump for your needs but how do you dertermine how much flow you need?

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Jul 21, 2012
Pump flow
by: Larry

You can check out a pumps strength by its GPH rating; that's 'gallons per hour'.

To determine what you need find the number of gallons of water your growing container will hold then take off a percentage of it to account for your growing medium - maybe take off 40% for a dense substrate like pea stone or maybe 20% off for hydroton.

Once you determine this figure, this is the GPH you want pumped in and out every 15 minutes.

So a container using pea stone as a medium that was 10 gallons will hold maybe 5 gallons of water with medium in it.

So 5 gallons needs to be pumped in 15 minutes or 20 GPH. Take into account distance from pump to container and increase your GPH accordingly - check the 'hydroponic pump' tab on this site for info on how to do this.

And this is how to determine the GPH of the pump you want.

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