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#1
04-06-2008, 11:33 PM
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I bought a gauge for my system.
I lost about 20 psi (when the system was running, same psi when it is stopped, of course) with the 1/4 inch line. The 3/8 line has maybe a 1 psi pressure drop, so from 60 to 59 psi, if even that bad. Don't do 1/4 line!!!!!!!!!!!!!!!!!!!!! 3/8 works perfect, absolutely perfect. The only problem is if you decide to make 100 gallons of water, then my tank drops about 5F in temp. But in normal use it is 100%.
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250 BB Starphire SPS, clams, & zoos 3 x 250 DE, IC 660 W/T5s OM 4-way, Hammerhead Pump Calcium, Kalk, RO filters, magnesium, Excellent prices 
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#2
04-07-2008, 02:57 AM
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Your pressure loss using a 1/4 inch line versus 1/2 should be almost the same. Being that friction loss is directly tied to flow rate it seems to me that the flow rate for an RO unit is very small. A 50 gallon per day RO unit delivers about .03472 gallons a minute. This translates to a very small pressure loss regardless of the size of your line.
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250 gal display tank plumbed directly to my wallet
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#3
04-09-2008, 01:57 PM
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Was running the 1/4" supply line through my sump for a while but abandon because of the pressure drop.
There is merit though in warming the RO. Cutting from here (Aqua-safe) "membranes are flow rated at 77F, 65 PSI and 200 TDS and for every 1F water temperature, the production rate will drop 1.6%"
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#4
01-05-2009, 03:10 PM
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Has anyone come up with more options for heating their supply water since this thread last posted? I just installed my new RO/DI and I was thinking of coiling about 10 feet of 1/4" supply line and attaching an 8W repti-therm heater to it.
Not sure if that will give me enough time to heat the water much...any thoughts?
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Mark...  290g Peninsula Display, 425g total volume. Setup Jan 2013.
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