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Old 12-23-2008, 12:28 PM   #11
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well my warm water experiment yielded no blatently obvious results. Next step is to check the pressure, then boost it. I suspect this is the culprit.
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Old 12-23-2008, 04:40 PM   #12
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Neilan and I were talking about this the other day. I have a similar unit and I am able to fill my 32g trashcan in less then 12 hours. I'm on well water here and I'm getting about 55psi at the tap.

I'm wondering if maybe there is a filter that isn't seated or has something blocking it. I can't imagine city water being short on pressure espeically in the area you are in. That is a somewhat recent development. Less then 10 years old I believe.
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Old 12-23-2008, 05:09 PM   #13
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asked and discounted already
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Old 12-23-2008, 11:06 PM   #14
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I agree with Mike. Cold water slows an RO unit to a trickle.
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Old 12-24-2008, 03:10 PM   #15
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So finally got a pressure guage. Couldn't find one locally (believe it or not) so I ordered an inline one from AWI and it just got here. I tapped it in between the piercing saddle valve where I tap my water supply and the input to the filter. I'm getting 48psi. Maybe a little on the low side, but not enough I would think to give me the results I'm seeing.

The other night I did some more investigating. I disconnected the input to the RO membrane and checked the water flow through the first 3 stages since this was simple enough to do. Have plenty of pressure there. Then, the output of the membrane is at a trickle, so the issue is in there somewhere. Either it's not seated right, or it's a bad membrane is what I'm thinking.
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Old 12-28-2008, 10:55 PM   #16
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The home RO membranes are designed for 60 - 100 psi. If your tap doesn't have that, then a booster is in order. Additionally, the performance increases with the higher pressure (TDS output is lower if input pressure is higher). If you have a lot of bio's in your water, it will speed up the decay of the membrane too.
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Old 12-30-2008, 04:36 PM   #17
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Quote:
Originally Posted by lynxpilot View Post
The home RO membranes are designed for 60 - 100 psi. If your tap doesn't have that, then a booster is in order. Additionally, the performance increases with the higher pressure (TDS output is lower if input pressure is higher). If you have a lot of bio's in your water, it will speed up the decay of the membrane too.
I think there is more to it then the pressure. I am on a well and have a pressure tank to feed the house we are set at 55psi in the house and my RO/DI unit will fill a 32g trash can in less then 12 hours.

Most RO/DI units sold should be anywhere from 50-70psi. With water temps in teh 70s they will produce at max performance. My water out of the tap is 57.3 and I'm still generating that amount of water with 0 TDS output.

I think Neilan is correct in that there is something wrong with his membrane.
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Old 01-01-2009, 10:54 PM   #18
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We have a brand new (about 1 mo old) 6 stage unit. It is filtering at a trickle in this cold weather as well. Cold here has meant sub zero. We have a 35 gallon garbage can that the filter runs into. We turn it on in the evening and let it run all night. That seems to work ok (except for the day that I went to school and forgot to shut it off!). Weather is definitely a factor. I just filter constantly. 35 gallon garbage can and lots of 5 gallon buckets!

Remember: cold is a relative descriptor depending on where you llive!
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Old 01-25-2009, 10:12 PM   #19
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just an update. I had finally gotten convinced something was wrong, more than just pressure and temperature, so I bought a replacement membrane.

My production is up more than 300%.
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Old 01-25-2009, 11:03 PM   #20
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It's great to hear you solved this problem. i guess we will add dramatic reduction in output as a reason to suspect the membranes.
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