waste ratio with booster pump

[cichlidtx]

I'm replacing my RO membrane as it's running at 92% rejection rate. I also purchased a new flow restrictor to set at 4:1 ratio. My question is do I measure the waste and product rate with my booster pump running? I did not change the previous restrictor when I added the booster pump. Thanks

[AZDesertRat]

Yes, you measure and adjust the waste ratio using whatever pressure you will be operating at. I run my Aquatec 8800 booster at 95-100 psi so set the waste ratio at that pressure.

[cichlidtx]

Thank you sir, that's what I thought just wanted to double check.

[cichlidtx]

One more question. The Spectrapure directions say to:

 

13. If there are DI cartridges installed in this system, remove them and screw

the empty housings back on. Don’t run flush water through the DI resin.

14. Turn on the system water supply.

15. If you are replacing your current membrane with a different size

membrane, you will need to remove your old flow restrictor and replace

it with the new one. Then, follow the adjustment procedure for the new

flow restrictor as shown on pages 9-10. Do I do this without the DI cartridge in?

[AZDesertRat]

I have posted my new filter and membrane flushing sequence thousands of times. It is best to install one filter at a time and flush it individually before installing the next to remove traces of glues, binders, antimicrobial chemicals, carbon dust etc. If installing a new membrane make at least 3-5 gallons of RO water to the drain before installing the DI so you don't exhaust the resin prematurely. Do a quick search using my username and disinfection or filter replacement and it will bring up lots of threads on the subject.

[cichlidtx]

Thanks for the help but that wasn't what I was asking. I was asking about setting the waste ratio with the DI cartridge installed or not. I will search for answers. I really wish the moderators would sticky your information so you wouldn't have to answer the same questions all the time, I appreciate it.

[AZDesertRat]

The DI will not have any effect on the waste ratio

[ezcompany]

I'm replacing my RO membrane as it's running at 92% rejection rate. I also purchased a new flow restrictor to set at 4:1 ratio. My question is do I measure the waste and product rate with my booster pump running? I did not change the previous restrictor when I added the booster pump. Thanks

 

Can I ask where you purchased the flow restrictor for a 4:1 ratio? or is it something you have to set yourself?

[cichlidtx]

I purchased from Spectrapure and you need to trim it to get to the correct ratio. I also purchased one from Bulk Reef Supply which needs to be trimmed as well. Make sure you order the correct one for your RODI system GPD rating.