Best RO membrane for the money?

jefft321

New member
I need a replacement RO membrane. I have seen the Filmtec models at several on line sites. Salty Supply has one that is 100 GPD for around $40. That seems cheap? I have heard the higher volume ones are not as efficient? I think the rejection rate on the Dow Filmtec is 90%
It seems like the models that produce less water per day are more efficient?
The Spectrapure seem much more expensive, is there anything comparable that is cheaper?
Also, shoud I be using the 1 or .5 micron pre-filter and carbon block?
Thanks.
 

sreefs

New member
Spectrapure had their 90 GPD membrane on sale for 40 dollars for RC members, not sure if it still is. This has 98% rejection, you will need a new flow restrictor, depending on what you have now.
Pat
 

Hal

New member
Check Bulk Reef Supply, a sponsor here. They sell a 75 gpd and a 150 gpd, both with 98% rejection rate.

Most places recommend a new flow restrictor when you replace the membrane.
 

solitude127

Proud user of IO Salt!
I bought a BRS supply membrane for my RO. It's about 9 months old and is still only putting out 1 TDS. The efficency is pretty good too. So far, I'm 3 bad to 1 good. My other membrane was 4-5bad to 1 good.
 

old salty

Genius
Premium Member
I am using a Buckeye Field Supply 150gpd membrane in conjunction with a pressure boosting pump. So far, after two years of operation, it's still running like a champ. My RO TDS is 2.4ppm; low enough that the DI resin lasts a very long time. I also use the more expensive pre-filters and carbon blocks because it's important to protect the RO membrane.
 

Toddrtrex

Premium Member
I would get the Dow Filmtec 75 GPD one (( that is what I have always used )), love the 96-98% rejection rate. With my water's temp and pressure I fill my 5 gallon containers in 2 hours, which works out perfectly for me.
 

flamron

Professional Stick Gluer
Premium Member
The efficiency of the 75gpd membranes typically outweigh the output of the lesser efficient larger gpd models.

+1 on the Filmtec 75gpd. I fill a 4.5G container in 1.5-1.75hrs.
 

old salty

Genius
Premium Member
<a href=showthread.php?s=&postid=15441139#post15441139 target=_blank>Originally posted</a> by flamron
The efficiency of the 75gpd membranes typically outweigh the output of the lesser efficient larger gpd models.

+1 on the Filmtec 75gpd. I fill a 4.5G container in 1.5-1.75hrs.



The BFS 150gpd membrane I am using is currently working at 98% rejection and produces about 180gpd during the summer months. I agree that anyone looking for a filter should definitely steer clear from the 90% rejection membranes; the DI resin tends to get used up much faster.
 

DarG

New member
Most of the Vendors are selling the Dow Filmtecs.

My close to 3 year old 75 GPD Filmtec is still running at over 98% rejection. 2 ppm TDS after RO with my supply water TDS at 160 ppm.
 
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