Ok so last year, I got a RO-DI filter from Pure Water Products. Membrane is their Pentair GRO-50, which is a 1:1 water-waste ratio membrane.
Everything was worked fine for about a year. Then the water production dropped. I diagnosed that the membrane was not producing water, it was only a drip drip. Pure Water Products sent me a free replacement membrane (which was nice of them). That worked for 10 days and back to drip drip. It measures to around 40 ml per minute. It should be around 150 ml per minute.
Have been troubleshooting for a days now, already checked the water pressure, flow, temps, etc. All is well. I have even dismantled the unit and individually checked the parts. No blockage. Drain water is measuring around 180 ml / min. Has a 150 ml flow restrictor....which is what Pentair recommends for this particular membrane. I am probably producing-using 20 gallons per day or less. I am on city water, 175 TDS input. Fairfax, VA, known to have chloramines. TDS for output is 1-3. Output after DI is 0
I am at the end of troubleshooting with Joe from Pure Water Products (he has been very helpful, BTW)...........but we still do not know what the problem is. I don't want to get a replacement membrane, only to foul it again.
So what I am asking is:
1. Is anyone else using these fancy 1:1 membranes?
2. Am I using too little pre-filtration?
I have one sediment and one chloramine reducing carbon block. Both seem to be ok, judging from the water flow post those two filters.
3. Any suggestions on what I should test next?
Or should I call it a day and go with the usual 1:4 membranes?
50 GPD - Pentair GRO-50ENEncapsulated Membrane w/ Quick Connect Fittings – Pure Water Products, LLC
www.purewaterproducts.com
Everything was worked fine for about a year. Then the water production dropped. I diagnosed that the membrane was not producing water, it was only a drip drip. Pure Water Products sent me a free replacement membrane (which was nice of them). That worked for 10 days and back to drip drip. It measures to around 40 ml per minute. It should be around 150 ml per minute.
Have been troubleshooting for a days now, already checked the water pressure, flow, temps, etc. All is well. I have even dismantled the unit and individually checked the parts. No blockage. Drain water is measuring around 180 ml / min. Has a 150 ml flow restrictor....which is what Pentair recommends for this particular membrane. I am probably producing-using 20 gallons per day or less. I am on city water, 175 TDS input. Fairfax, VA, known to have chloramines. TDS for output is 1-3. Output after DI is 0
I am at the end of troubleshooting with Joe from Pure Water Products (he has been very helpful, BTW)...........but we still do not know what the problem is. I don't want to get a replacement membrane, only to foul it again.
So what I am asking is:
1. Is anyone else using these fancy 1:1 membranes?
2. Am I using too little pre-filtration?
I have one sediment and one chloramine reducing carbon block. Both seem to be ok, judging from the water flow post those two filters.
3. Any suggestions on what I should test next?
Or should I call it a day and go with the usual 1:4 membranes?