RO output dependant only on RO membrane?

[JoeMomma]

Noob question.

As the title states, is it the RO membrane that determines the GPD of the RO/DI filter? If I currently have a 75 GPD filter but buy a RO membrane capable of 100 GPD will that increase my daily production? Will it even fit?

Also, are all the filter cartridges compatible all the RO/DI filters from different manufacturers? They all look similar enough.

Thanks!

 

[James77]

Yes it will fit, but you will need to add the appropriate flow restrictor to the waste line-they are matched to the GPD of the membrane. Almost all the filters are interchangeable, although there are different sized filters, but there is a huge difference in size- spectrapure sells some that are 2x the size of the typical ones.

 

[James77]

Shows the membranes/flow restrictors, great company to deal with also.

http://thefilterguys.biz/ro_membranes.htm

 

[Mike31154]

Note that the rejection rate of a 100gpd membrane is not quite as good as the 75gpd, so if you're not in a real hurry for water, you may be better off with a 75gpd membrane. Input water temperature and pressure also affect production rates. Very cold water and low water pressure will reduce the efficiency.

 

[RokleM]

<a href=showthread.php?s=&postid=15434600#post15434600 target=_blank>Originally posted</a> by Mike31154
Note that the rejection rate of a 100gpd membrane is not quite as good as the 75gpd, so if you're not in a real hurry for water, you may be better off with a 75gpd membrane. Input water temperature and pressure also affect production rates. Very cold water and low water pressure will reduce the efficiency.

:thumbsup:

As mentioned, you might have better luck "tweaking" or further customizing your current solution rather than just replacing parts.

calculator:
http://buckeyefieldsupply.com/calc.php

 

[nauticac4]

Bulk reef supply has a 150GPD. I upgraded and am happy with the results.

 

[Macimage]

The 75 gpd membranes usually have a rejection rate of 98%, whereas, the 100 gpd membranes typically have a lower rejection rate of 90% and will use up your DI quicker.

The 75 gpd is usually the better choice or two 75 gpd's for a 150 system.

Joyce

 

[ItsMee]

<a href=showthread.php?s=&postid=15434241#post15434241 target=_blank>Originally posted</a> by James77
Shows the membranes/flow restrictors, great company to deal with also.

http://thefilterguys.biz/ro_membranes.htm

I know this quote is old, but I have a question.
If you follow that link (http://thefilterguys.biz/ro_membranes.htm) you will see that the membrane for 150GPD has a different nipple then all the others. It has slits in it. Why?