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Old 12/08/2018, 03:39 PM   #1
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Join Date: Jul 2010
Location: Dublin, OH
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multiple flow restrictors on RODI?

i have a 75GPD RO membrane but have 450 and 300 flow restrictors and I believe I need a 550. I'm planning on getting the correct one ordered but looking for something as a quick fix as setting everything back up. Can I just run them both on the same line so i get more restriction or will it not doing anything?

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Old 12/08/2018, 04:39 PM   #2
Vinny Kreyling
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Location: Miller Place, NY
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Basically you are looking for a 4-1 ratio,
4 gallons of waste water for every gallon of product.
Whatever gets you there, you may have to settle getting close.

250 gallon mixed reef, 2 Reefbreeder's Photon V 2, RD 3 Speedy 80 Watt, DAS EX-3 Skimmer, MTC mini cal, 2-3/4" Sea Swirls, Aquacontroller & 6 Tunze pumps.
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Old 12/08/2018, 05:16 PM   #3
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you can make yourself an adjustable flow restrictor very easily using parts from home depot....

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Current Tank Info: 75 Gal. Mixed reef
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Old 12/08/2018, 06:20 PM   #4
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Originally Posted by outssider View Post
you can make yourself an adjustable flow restrictor very easily using parts from home depot....
Despite that not being on the product water line I would batik be hesitant to be using copper plumbing parts with anything thatís going to be near my tanks water due to possible corrosion issues.

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Old 12/09/2018, 02:19 AM   #5
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The flow restrictors we can easily buy are not so accurate in their flow rating. I'm using a rodi 1/4" ball valve and adjust to get 3.5~4:1 ratio of waste and purified water.

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