February 20th 04, 10:58 PM
Hi,
I am preparing to get an under-sink RO system with pressurized storage tank for
both drinking and aquarium use, and have a question about the auto shut-off
(ASO) valves included in most systems.
When the ASO valve is activated it shuts down the input to the RO cartridge and
causes the pressure differential across the membrane to decrease (and maybe even
reverse). If residual water remains in the cartridge, will this situation allow
any significant amout of impurities to pass from the "dirty" side to the "clean"
side of the membrane, especially at night when this condition would last for
many hours?
Would it be better to shut off the flow at the brine (dirty) output of the RO
cartridge rather than the input? If so, are there any valves that would do this
based on the pressure in the storage tank, just like the regular ASO does?
Or am I making a mountain out of a molehill?
Thanks for any info.
**********End Of Post*************
I Don't think it matters but then again I'm no expert on The subject. Try these guys
http://www.roultratec.com/company.asp
If the girl on the phone can't answer to your satisfaction she'll put someone on that can.
I've had one of there 100gpd with a holding tank for several years and no problems.
This is one of the few companys that I can rave about ,great prices and excellent
cus't service.I have mentioned this before but replacement filters all 5 was around $35,
and I took apart the end of the ro cap thinking it was clogged(Don't do that). They
sent me a new one free of charge. Oh it wasn't clogged the low flow was due to water temp.
under 40deg, after getting the new cap I tapped into the hot water to mix with the cold
to get 60deg and this bad boy is working perfect again
I am preparing to get an under-sink RO system with pressurized storage tank for
both drinking and aquarium use, and have a question about the auto shut-off
(ASO) valves included in most systems.
When the ASO valve is activated it shuts down the input to the RO cartridge and
causes the pressure differential across the membrane to decrease (and maybe even
reverse). If residual water remains in the cartridge, will this situation allow
any significant amout of impurities to pass from the "dirty" side to the "clean"
side of the membrane, especially at night when this condition would last for
many hours?
Would it be better to shut off the flow at the brine (dirty) output of the RO
cartridge rather than the input? If so, are there any valves that would do this
based on the pressure in the storage tank, just like the regular ASO does?
Or am I making a mountain out of a molehill?
Thanks for any info.
**********End Of Post*************
I Don't think it matters but then again I'm no expert on The subject. Try these guys
http://www.roultratec.com/company.asp
If the girl on the phone can't answer to your satisfaction she'll put someone on that can.
I've had one of there 100gpd with a holding tank for several years and no problems.
This is one of the few companys that I can rave about ,great prices and excellent
cus't service.I have mentioned this before but replacement filters all 5 was around $35,
and I took apart the end of the ro cap thinking it was clogged(Don't do that). They
sent me a new one free of charge. Oh it wasn't clogged the low flow was due to water temp.
under 40deg, after getting the new cap I tapped into the hot water to mix with the cold
to get 60deg and this bad boy is working perfect again