What is wrong with my brs ro membrane?

chris124 · Feb 8, 2016

MikeyAl said:
Did you back flush?

Yeah for five minutes and now the tds coming out of the membrane is 3 tds. So that's better. The DI seems to be depleting fast. Could be c02 any ideas?

MikeyAl · Feb 8, 2016

You might TDS creep which happens a lot to systems that are not used often- like yours.

Check out this vid on YouTube. That is what I was dealing with as well.

Mat1018 · Feb 8, 2016

One thing it might be. Does it have a flow restrictor on it? I had someone that flew through membranes until I saw the unit missing the flow restrictor and pretty much just in flush mode all the time. After adding one the unit worked like it should of. Pressure would still read normal if one is missing.

chris124 · Feb 8, 2016

Mat1018 said:
One thing it might be. Does it have a flow restrictor on it? I had someone that flew through membranes until I saw the unit missing the flow restrictor and pretty much just in flush mode all the time. After adding one the unit worked like it should of. Pressure would still read normal if one is missing.

Yes a flow 550.

chris124 · Feb 8, 2016

MikeyAl said:
You might TDS creep which happens a lot to systems that are not used often- like yours.

Check out this vid on YouTube. That is what I was dealing with as well.

When storing it for more than a week should I flush it?

Mat1018 · Feb 8, 2016

I rarely flush my system and have had it for 2.5 years and my out put before my DI is always 3-4 then 0 after DI. Don't know much about RO units just the basics.

MikeyAl · Feb 10, 2016

I usually back flush if it sits more than 2 weeks but I don't have the best source water. Watch your tds meter.

chris124 · Feb 10, 2016

Well it seems to be working now. As for the depletion of my Di I think thats co2. Because my tap ph is always on the low side.

chris124 · Feb 10, 2016

Tap ph is below 7.0.

AZDesertRat · Feb 12, 2016

Do not try to adjust the temperature, colder wate ractually treats better and gives you lower RO only TDS. 77 degrees is just a number the industry adopted as a standard so everyone would be comparing apples to apples but it is by no means the best temperature.
A flush kit is a waste of time. A DI bypass valve to flush the TDS creep that happens when the system is off is a good idea though and different than a flush kit since it is on the treated side of the membrane while a flush kit is on the waste side..
Your waste ratio of 3:1 to 4:1 is correct for your conditions but you really want to measure it using a clock or watch and measuring cup. Never assume anything.
You can measure your CO2 content using your pH and alkalinity and this nomograph:
http://spectrapure.com/frequently-asked-questions#calcc02
or you can buy a test kit to test it more accurately here:
http://spectrapure.com/TEST-KITS-METERS/CHEMICAL-TEST-KITS

CO2 depeletes DI resin and does not appear as TDS so can be tricky to deal with.

chris124 · Feb 12, 2016

AZDesertRat said:
Do not try to adjust the temperature, colder wate ractually treats better and gives you lower RO only TDS. 77 degrees is just a number the industry adopted as a standard so everyone would be comparing apples to apples but it is by no means the best temperature.
A flush kit is a waste of time. A DI bypass valve to flush the TDS creep that happens when the system is off is a good idea though and different than a flush kit since it is on the treated side of the membrane while a flush kit is on the waste side..
Your waste ratio of 3:1 to 4:1 is correct for your conditions but you really want to measure it using a clock or watch and measuring cup. Never assume anything.
You can measure your CO2 content using your pH and alkalinity and this nomograph:
http://spectrapure.com/frequently-asked-questions#calcc02
or you can buy a test kit to test it more accurately here:
http://spectrapure.com/TEST-KITS-METERS/CHEMICAL-TEST-KITS

CO2 depeletes DI resin and does not appear as TDS so can be tricky to deal with.

Thanks. Just one more question. How do you clean your rodi unit?