Ro production nightmare

[ched999uk]

It looks correct if you are running the waste from 1st membrane to second and waste from 2nd to 3rd? Does that not clog up the 2nd and 3rd membrane very quickly or is your tap tds very low to start with?

Is it worth checking the flow after the filters, then after pump, then just 1 membrane at a time? That might show you where the flow is slowing down?

 

[Iron Giant]

It looks correct if you are running the waste from 1st membrane to second and waste from 2nd to 3rd? Does that not clog up the 2nd and 3rd membrane very quickly or is your tap tds very low to start with?

Is it worth checking the flow after the filters, then after pump, then just 1 membrane at a time? That might show you where the flow is slowing down?

That's a normal set up on an R/O my tap tds is around 70ppm, 

No slow flow this post was started years ago, I just dropped the question in yesterday rather starting a new post

 

[ched999uk]

That's a normal set up on an R/O my tap tds is around 70ppm, 

No slow flow this post was started years ago, I just dropped the question in yesterday rather starting a new post

70tds is nice and low so I guess you just save on waste ratio?

 

[Iron Giant]

70tds is nice and low so I guess you just save on waste ratio?

A standard R/O runs at 2/1 so 2 litres of waste to 1 litre of pure 

 

[ched999uk]

A standard R/O runs at 2/1 so 2 litres of waste to 1 litre of pure 

What ratio do you manage?

 

[TWC]

It looks correct if you are running the waste from 1st membrane to second and waste from 2nd to 3rd? Does that not clog up the 2nd and 3rd membrane very quickly or is your tap tds very low to start with?

That’s exactly what I thought when looking at it. On my RO the feed from the prefilters goes into each of my three membranes. At the other end I have a pure feed and waste feed coming out of each membrane. They just all join back together. 

Excuse the bad photos and cobwebs ?

 

[ched999uk]

That’s exactly what I thought when looking at it. On my RO the feed from the prefilters goes into each of my three membranes. At the other end I have a pure feed and waste feed coming out of each membrane. They just all join back together. 

Excuse the bad photos and cobwebs ?

View attachment 23228

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I think running waste through membrane is OK when your tds is so low (70tds). It's a great way to reduce your waste water though. It would be interesting to do the calcs on membrane costs vs waste water costs but I think running waste through membrane also speeds up production.

I think your setup is more normal for higher tds.

 

[TWC]

Yes my input is around 350. 

Can only dream of 70 ?