ro/di unit question

[rkizer06140]

i have a 5 stage ro/di unit and i bought a 150gpd ro, membrane, well the unit i have came with a 75gpd membrane, and the filter guy sent me a note that said id have to upgrade my flow restrictor to a 150gpd, my question is, why is this? and will the restictor i have work with this 150gpd membrane w/o compramising water quality? i would call him but hes been sick and not answering the phone.

 

[outssider]

he wants you to upgrade so you get the proper ratio of waste to good water. the ball park figure is 4/1, waste to good. I actually went from a 100 gpd to a 75 gpd because i read that the 75 gpd (Dow Filmtec) was supposed to be one of the best !

I built my own adjustable flow restrictor from parts at lowe's.

 

[hottuna]

he wants you to upgrade so you get the proper ratio of waste to good water. the ball park figure is 4/1, waste to good. I actually went from a 100 gpd to a 75 gpd because i read that the 75 gpd (Dow Filmtec) was supposed to be one of the best !

I built my own adjustable flow restrictor from parts at lowe's.

Can u show US how to make one ???? thanks

 

[dkeller_nc]

While you can build one out of nothing other than an adjustable gate valve, you can buy these very inexpensively.

 

[outssider]

[/B]
Can u show US how to make one ???? thanks

can't remember what it's called but I got it at lowe's...

it's brass...that other plastic valve is my flush....although that could probably be used as a restrictor as well.

 

[Vinny Kreyling]

Flow restrictors are membrane specific to GPH.

 

[rkizer06140]

ok, thanks ill just order the part i need, and then go with the 75gpd dow filmtec after this one is exhausted tyvm for the info !

 

[reef_aholic]

You are looking for a needle valve. That is how you make a fine tune adjustment to flow.

 

[hottuna]

While you can build one out of nothing other than an adjustable gate valve, you can buy these very inexpensively.

my experience is that u need several of these on hand...to get the ratio @ exactly 4:1...and then you have to cut them sometimes -its a hassle,and expensive...the adjustable valve idea is great ! ,,,then u can recalibrate and fine tune the output from time to time....

 

[salty joe]

You are looking for a needle valve. That is how you make a fine tune adjustment to flow.

You beat me to it reefaholic! I bought this one because the temp of my tap water changes drastically with the seasons. http://www.buckeyehydro.com/mini-needle-valve/

 

[Buckeye Hydro]

Joe - this one is more precise and better for your application
http://www.buckeyehydro.com/precision-poly-needle-valve/

Russ

 

[meidinad]

They're $7 on BRS. Buy one. Don't make it.