RO/DI flow restrictor

[Baconbeast]

I just installed a 100gpd 4 stage RO/DI filter with 800 flow restrictor. Do to cold water (probably 60*) and a psi of 54, I’m getting a waste ratio of 25:1. This seems extremely wasteful. I don’t know how much a booster pump would help, but I thought maybe it would make more sense to try increasing the flow restrictor first.

I have a water softener and my manual says that a water softener greatly reduces the chance of the membrane clogging. So can I just switch out the 800 for a 550? Would this reduce my waste to something more reasonable? I don’t need or want to go less than 4:1 but I need to improve the 25:1. I don’t need to get 100 gpd, I just want to be less wasteful.

I am finding a lot of blanket answers just giving me the general recommendations for a 100 gpd membrane. I can understand if I was operating at the 4:1 ratio, not wanting to restrict the flow more, but I’m at 25:1, wouldn’t it make sense to give the water more time to work through the filter to try and get closer to the 4:1?

 

[Tangdora]

How old is the membrane

 

[KStatefan]

I just installed a 100gpd 4 stage RO/DI filter with 800 flow restrictor. Do to cold water (probably 60*) and a psi of 54, I’m getting a waste ratio of 25:1. This seems extremely wasteful. I don’t know how much a booster pump would help, but I thought maybe it would make more sense to try increasing the flow restrictor first.

I have a water softener and my manual says that a water softener greatly reduces the chance of the membrane clogging. So can I just switch out the 800 for a 550? Would this reduce my waste to something more reasonable? I don’t need or want to go less than 4:1 but I need to improve the 25:1. I don’t need to get 100 gpd, I just want to be less wasteful.

I am finding a lot of blanket answers just giving me the general recommendations for a 100 gpd membrane. I can understand if I was operating at the 4:1 ratio, not wanting to restrict the flow more, but I’m at 25:1, wouldn’t it make sense to give the water more time to work through the filter to try and get closer to the 4:1?

There must be a problem else where restricting the flow out of the membrane or the flow restritor is not really 800ml/min.

I target a ratio of 3:1 on my system with softened water.

 

[Sabellafella]

I just installed a 100gpd 4 stage RO/DI filter with 800 flow restrictor. Do to cold water (probably 60*) and a psi of 54, I’m getting a waste ratio of 25:1. This seems extremely wasteful. I don’t know how much a booster pump would help, but I thought maybe it would make more sense to try increasing the flow restrictor first.

I have a water softener and my manual says that a water softener greatly reduces the chance of the membrane clogging. So can I just switch out the 800 for a 550? Would this reduce my waste to something morel reasonable? I don’t need or want to go less than 4:1 but I need to improve the 25:1. I don’t need to get 100 gpd, I just want to be less wasteful.

I am finding a lot of blanket answers just giving me the general recommendations for a 100 gpd membrane. I can understand if I was operating at the 4:1 ratio, not wanting to restrict the flow more, but I’m at 25:1, wouldn’t it make sense to give the water more time to work through the filter to try and get closer to the 4:1?

I started using these as of recently, got a very large rodi system and it just made so much sense to use these from here on out.

You would have to match the flow meter size/rating to your membrane output respectively.

If your getting let's say 4L per minute into the system. You should be rejecting 2L to 3L. You can play around with the needle valve and check tds values. Can push the membrane efficiently based on rejection values and so fourth. Plus theres tons of room for saving some extra water. Super cool but it is a bit expensive.

 

[Baconbeast]

I started using these as of recently, got a very large rodi system and it just made so much sense to use these from here on out.

You would have to match the flow meter size/rating to your membrane output respectively.

If your getting let's say 4L per minute into the system. You should be rejecting 2L to 3L. You can play around with the needle valve and check tds values. Can push the membrane efficiently based on rejection values and so fourth. Plus theres tons of room for saving some extra water. Super cool but it is a bit expensive.

Thank you for the response, I ended up contacting the manufacturer at it turned out I had a faulty membrane.

 

[Baconbeast]

There must be a problem else where restricting the flow out of the membrane or the flow restritor is not really 800ml/min.

I target a ratio of 3:1 on my system with softened water.

I think I’m between 2-3 to 1 with the new membrane. Glad that was a quick fix

 

[Baconbeast]

How old is the membrane

It was brand new. Seller sent me a new one and it’s all good now.