What TDS do you have BEFORE it goes through your DI

[BaliReefBox]

Hi trying to get a feel for the efficiency of others members ro membrane. Would you mind sharing GPD system, INPUT tds post ro membrane tds and final post ri tds... thanks for sharing cheers

 

[brclark82]

100gpd and around 500 tds tap, I have low pressure around 40 which should mean lower efficiency and I get 4-5 tds before DI

 

[mfinn]

I have a 100gpd system with a TDS of tap water of about 100.
After the membrane it's 2-3, and 0 after di.

 

[DJF]

7 leaving RO membrane

 

[MBruun]

Tap water 430. Before DI 7 after DI < 1

 

[exnisstech]

Two 75 gpd membranes in series. Tap 115, after membrane 3, di 0. I have low pressure and use an RO buddy booster pump.
EDIT: I'm not even sure if my membrane brand. I bought them from Amazon a year or so ago and installed them last month. Been happy with the performance.

 

[Reefer Matt]

Tap is about 150 ppm. After ro membrane is 2 ppm. 98% efficiency. No booster pump, 45 psi, single 75 gpd membrane. Then 3 stages of resin. Cation, anion, and mixed.

 

[KStatefan]

My current membrane is a Filmtec Aqualast 1812HR
Since July I have averaged 6.2 out of membrane and 387 source water 98.4% rejection.

One year average with a Filmtec TW30-1812-50HR 387 in 5.7 out 98.5% rejection
One year average with a Spectrapure SpectraSelect Plus 385 in 7.0 out 98.2% rejection

 

[Coach v]

Single 75gpd membrane, booster pump at 100psi. 50 TDS going in, 1-2 TDS pre-di, 0 after. My di lasts a long time.

 

[Lbrdsoxfan]

Do a search, this was covered recently...

 

[Mr. Roboto]

36ppm

 

[apb03]

I'm between 0-2ppm before it hits my DI.

 

[thatmanMIKEson]

Hi trying to get a feel for the efficiency of others members ro membrane. Would you mind sharing GPD system, INPUT tds post ro membrane tds and final post ri tds... thanks for sharing cheers

incoming between 220- 300 depending on time of day sometimes more, sometimes magically its under 200, but after 2 sediment, 3 carbonblocks and dual membranes it's at 3-4 I change membranes at 5+tds, I run 4 stages of d.i last one being "silicate buster" it's usually 1tds after the first stage and always 0 out the end. I have 11 stages total with a booster pump I run the pump at 90psi for a 20min membarane and carbon block flush lowering the tds into range before I enguage the membranes and begin to flush the d.i stages which I flush for about 5min, usually just enough time to push all the old water out of the system, then I slowly lower the psi to around 65psi sometimes the tds will want to creep back up as psi lowers this may take a little more time, i lower the flow rate through the d.i as I collect water 300gallons at a time on float valves and auto shutoff. I like to manually flush the membranes post collection.

 

[spsick]

My current membrane is a Filmtec Aqualast 1812HR
Since July I have averaged 6.2 out of membrane and 387 source water 98.4% rejection.

One year average with a Filmtec TW30-1812-50HR 387 in 5.7 out 98.5% rejection
One year average with a Spectrapure SpectraSelect Plus 385 in 7.0 out 98.2% rejection

Is that aqualast better in some way than the standard BW60-12?

 

[KStatefan]

Is that aqualast better in some way than the standard BW60-12?

They did the redesign on the Aqualast before the BW60 at that time it looked like it might be better for hard water.

 

[Jedi Knghit]

Tap: 150
Membrane: 2
DI: 0

Pressure is 65, no booster

 

[WhatCouldGoWrong71]

Hi trying to get a feel for the efficiency of others members ro membrane. Would you mind sharing GPD system, INPUT tds post ro membrane tds and final post ri tds... thanks for sharing cheers

I think I am close to 1:1, today is a big water change day about to start, I’ll fill both the brutes up top by 6 I bet, as I will likely use both today. I ran all the tests about a month ago, I’ll have to look. I had a bad membrane that was causing all sorts of issues, well that and channeling, that’s a headache when it happens on the backside of your DI resin. But my TDS is 43 before it enters the sediment block and 6 when it enters the first DI stage. Those are all the large water saver ROs I hate paying for water to go down the drain…

 

[WhatCouldGoWrong71]

I think I am close to 1:1, today is a big water change day about to start, I’ll fill both the brutes up top by 6 I bet, as I will likely use both today. I ran all the tests about a month ago, I’ll have to look. I had a bad membrane that was causing all sorts of issues, well that and channeling, that’s a headache when it happens on the backside of your DI resin. But my TDS is 43 before it enters the sediment block and 6 when it enters the first DI stage. Those are all the large water saver ROs I hate paying for water to go down the drain…

 

[Gtinnel]

Three membranes in series totaling 300gpd. Pressure is boosted to around 90psi. Tap water tds is around 100, pre di is 2-4 depending on outside temperature, and after the di is 0.

Also, my system is automated to bypass the restrictor to flush the membrane at the beginning, the end, and every 30 minutes of run time. I’ve heard mixed opinions on whether flushing helps or not though.