Pure expectations

[Diamond geezer]

How many ltrs of pure,can I expect from 18x6" di vessel with new resin installed.The output from my ro is 29ppm,cause my water pressure is only 40.The membrain is only 5 months old,Thanks

 

[P4dstar]

Whats your input? I have a 4040 RO, when the input was 400+ I was only just higher than you and I only have 30PSI.

According to the resin calculator you should get about 21k litres out of a 25 litre bag.

 

[Diamond geezer]

Sorry what do you mean by input.My ro is what they call a 4/40 I think, and my water pressure is 40psi.still 21k ltrs dosent seam to bad,as I only got 750 lts from my last resin change,but I think the resin was well past its best,just bought a fresh 25k bag,how many vessel fills do you think ill get 6-8 maybe? Thanks for the resin calculator,where did you get that,is it an industry standard?

 

[Diamond geezer]

Oh I see, my tap water,or input is 350ppm thanks

 

[P4dstar]

Sorry what do you mean by input.My ro is what they call a 4/40 I think, and my water pressure is 40psi.still 21k ltrs dosent seam to bad,as I only got 750 lts from my last resin change,but I think the resin was well past its best,just bought a fresh 25k bag,how many vessel fills do you think ill get 6-8 maybe? Thanks for the resin calculator,where did you get that,is it an industry standard?

What is your TDS at the tap, before it goes through the RO. Mine fluctuates between 130 and 330 at the mo but during summer it went as high as 440 I think. Even at 440 with a PSI of just 30 I was still getting similar results to you. I have no idea how many vessel refill's you will get on that size of vessel mate, can't work out what litre vessel it is just from the size.

The resin calculator I use is from the window cleaning warehouse;

https://www.windowcleaningwarehouse.co.uk/resin-calculator.html

I know there are others too.

Oh I see, my tap water,or input is 350ppm thanks

I would have expected a better output than that mate. Do you change your pre-filters regularly? Have you given it a good flush recently? Have you ever got better results out of the RO?

 

[Diamond geezer]

Ro membrain + pre filters changed together in March this year,thats 7 months ago,i think  your supposed to change pre filters every 3 months? Supose iam pushing it abit, what do you think please. My Ro out, of 29ppm has,nt changed much,new filters or not,as far as I recall, maybe + or- 2

Always flush 10-15 minuets before a run.

 

[P4dstar]

There is no real time frame you can put on it mate, it depends how much water you put through the system. There are 2 ways to measure this. One is to make a note of your waste to pure ratio and work out how much pure you've made each day, write it down and then do the maths to tell you when to change the filters. The other is to install a meter that measures how much water you're putting through the system. I have one, got it from Gardiners for about £30.

You need to change your sediment filter (usually white and the first filter) every 25k litres, your carbon one every 75k. Thats litres through the RO not litres of pure made.

With that kind of output I would worry that the membrane isn't working correctly. Flush it for a few hours with the new filters on that will help. Check all the O-Rings etc. Where are you measuring the PSI, at the tap or do you have a gauge between the pre-filters and the membrane?

 

[Diamond geezer]

Well  I replaced the membrain myself,the o rings seem ok ,no leaks,any way,Theres a psi meter in between pre filters and Ro. What kind of output should I expect please,with all thease known factors?

Flush for a few hours you say!

 

[P4dstar]

The RO should be reducing the TDS by at least 95% so ideally below 17. Considering the membrane is quite new it should be performing well and giving you somewhere near that even with slightly lower water pressure than the recommendation. Even if you accepted 93% say you would still be over this. You are getting just under 90% (I think they call it rejection rate)

Where did you get the membrane mate and is it HF4 or HF5?

 

[Diamond geezer]

As a newbie to WFP I  haven't used any where near 25kltrs since last filter change

Pure freedom and yes it is.

 

[P4dstar]

As a newbie to WFP I  haven't used any where near 25kltrs since last filter change

You might surprise yourself when you do the sums and factor in the waste water, remember its everything that goes through the RO not the amount you out on the windows.

 

[Diamond geezer]

Oh yes wasn't factoring waste water. Just looked up records membrain is HF5

 

[Diamond geezer]

Isnt the pure to waste ratio the same for every one, 40% pure to 60% waste? Ive only done 5k of pure.So that's about 12-13k isn't it or do I need to go back to school?

 

[P4dstar]

Isnt the pure to waste ratio the same for every one, 40% pure to 60% waste? Ive only done 5k of pure.So that's about 12-13k isn't it or do I need to go back to school?

Can't do maths at this time of night but there or there about. You should definitely be getting a better output from the membrane. Long term you need consider investing in a booster pump as this will help dramatically. The whole 60/40 thing is a matter of personal preference, I try to stick to something near that but when I flush and put the gate valve back its often slightly different. 

Where did you get the membrane from? A reputable window cleaning supplier or just an eBay job? 

 

[Diamond geezer]

Hello again. I spoke to pure freedom this morning,whom I bought the membrain from, after checking ppm,s first thing.In put ,was down to 260ppm which surprised me, out put 26,i had flushed for about an hr,after your suggestion.they noted I,d bought ro ,sept last yr,I did,nt fit till march,iam prity shure.Long &short,ive got 26ppm,they think it has prob risen,but ro is working cause of 90% reduction 95%achived only in factory conditions.They say must change any way at 30-35,so hey ho must just carry on I guess.They do recommend a pump I,ll do more maths My resin vessel is 6.9 ltr,so about 3-4 refills per 25k bag.Thanks again for resin checker.

 

[Diamond geezer]

Pure freedom also explained about the 60/40 thing,it has evolved, as there setting so iam not to worry Thanks

 

[Part Timer]

Hello again. I spoke to pure freedom this morning,whom I bought the membrain from, after checking ppm,s first thing.In put ,was down to 260ppm which surprised me, out put 26,i had flushed for about an hr,after your suggestion.they noted I,d bought ro ,sept last yr,I did,nt fit till march,iam prity shure.Long &short,ive got 26ppm,they think it has prob risen,but ro is working cause of 90% reduction 95%achived only in factory conditions.They say must change any way at 30-35,so hey ho must just carry on I guess.They do recommend a pump I,ll do more maths My resin vessel is 6.9 ltr,so about 3-4 refills per 25k bag.Thanks again for resin checker.

It has been known before that during resin shortages, Pure Freedom have sold low grade resin.

 

[ks789]

60 waste to 40 pure definitely not gonna work for everyone. If I have my waste valve set at that the tds goes higher. Maybe thats your prooblem, just an idea. It is strange, as I did get 60 /40 at one time, and get the tds down to 12/13 from tap reading of 530. Now have another membrane, for 40 21 Ro , thought would be the same one, but to get the low tds I have to have about 3 waste to 1 pure or 75 % to 25%. Gets it down to 13 from 530 which is great, just more waste water. So try adjusting the waste valve and taking readings with your tds tester and see if you can get lower after Ro and pre Di. Worth tinkering with.

 

[P4dstar]

Hello again. I spoke to pure freedom this morning,whom I bought the membrain from, after checking ppm,s first thing.In put ,was down to 260ppm which surprised me, out put 26,i had flushed for about an hr,after your suggestion.they noted I,d bought ro ,sept last yr,I did,nt fit till march,iam prity shure.Long &short,ive got 26ppm,they think it has prob risen,but ro is working cause of 90% reduction 95%achived only in factory conditions.They say must change any way at 30-35,so hey ho must just carry on I guess.They do recommend a pump I,ll do more maths My resin vessel is 6.9 ltr,so about 3-4 refills per 25k bag.Thanks again for resin checker.

I think we need @spruce for this one, he will be able to set the record straight! What I can tell you is I got 4PPM today from a 125 input at just 30PSI.My garage is not a factory! I would stick todays response from PF with the rest of the things i've heard about them. The only positives comments I have ever heard are about the trolleys.

I would look into a booster pump. Make do with what you have at least until you have one of them but when it comes time to replace the membrane I would ring Doug at Daqua.

 

[scottish cleaning service]

It you get 4ppm on a ro setup then you don't need to put it through the resin I imagine?

 

[P4dstar]

It you get 4ppm on a ro setup then you don't need to put it through the resin I imagine?

I am running a double DI. My TDS fluctuates so much I can go from 125 to 350 in a matter of hours so if I were to leave the RO filling and go off cleaning I could come back to a spoiled tank.
Personally I only work with 0. When the TDS goes to 1 I give the vessel a shake, when it goes back to 1 I change it


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