new filters

« **on:** April 17, 2008, 08:36:55 pm »

how long should you run your pure water pipe to waste when fitted new filters?

is it best to run it flushing or just normal?

« **Reply #1 on:** April 17, 2008, 09:39:28 pm »

anyone?

reason i ask i have just changed my prefilters but the TDS is still sky high 29 atthe moment

« **Reply #2 on:** April 17, 2008, 09:48:46 pm »

Quote from: dave0123 on April 17, 2008, 09:39:28 pm

anyone?

reason i ask i have just changed my prefilters but the TDS is still sky high 29 atthe moment

I would turn the valve to flush and let them run for about 1-2 hours.

« **Reply #3 on:** April 17, 2008, 09:51:47 pm »

Quote from: dave0123 on April 17, 2008, 09:39:28 pm

anyone?

reason i ask i have just changed my prefilters but the TDS is still sky high 29 atthe moment

Dave it looks like you may need new membranes.

Peter

« **Reply #4 on:** April 17, 2008, 09:54:42 pm »

I'm quite certain the pre filters do not come covered in any solution, you only need to flush the membranes through when they are new.

« **Reply #5 on:** April 17, 2008, 09:59:56 pm »

well am flushing it now anyway as the other option isnt working so.

« **Reply #6 on:** April 17, 2008, 10:03:39 pm »

Thanks Alex

« **Reply #7 on:** April 17, 2008, 11:37:15 pm »

I just changed my prefilter today and put on flush for an hour.

TDS before DI was 012 but i expect that will come down to about 6 in a day or so usually does.

« **Reply #8 on:** April 17, 2008, 11:59:09 pm »

Cheers paul will keep eye on it. So basicly they sort of settle in i spose?

goin to give it a good flush in the morning for few hours

« **Reply #9 on:** April 18, 2008, 12:03:30 am »

Dave what was the TDS just before the filter change?

Peter

« **Reply #10 on:** April 18, 2008, 12:10:31 am »

the TDS started to rise so they needed changing, before it was around 37 but in normal use it stays at 24.

iv only used the RO just hit three months and since the tds started to rise havent used WFP only using it on slected houses atm and leaded so havend made loads of water over the thre months peter.

dave

« **Reply #11 on:** April 18, 2008, 08:58:38 am »

Dave, is it a Merlin you are using? If so it would account for the high readings, if not then it could be a dodgy membrane or two. The readings are very high, and the membranes should last for years.

I take it you have a good flow coming from your waste?

The higher reading coming out the RO is associated with the membranes being on the way out and not the prefilters. The prefilters are usually monitored with the pressure gauge, a drop in pressure = change the prefilters.

Peter

« **Reply #12 on:** April 18, 2008, 10:58:23 am »

Hi Peter,

No its not a merlin its 300GPD Purefreedom RO, there is good pressure when the booster pump is working its 84psi but only makes around 27-28 litres per hour. yes theres good flow cuming from the waste, dont know how much tho.

when i changed these filters the pressure didnt rise again as if it dropped from the ones before. so do you think it could b a membrane? as i have never had the TDS out of the RO below 24 the tap tds is around 380 at the moment

« **Reply #13 on:** April 18, 2008, 12:25:01 pm »

Quote from: dave0123 on April 18, 2008, 10:58:23 am

Hi Peter,

No its not a merlin its 300GPD Purefreedom RO, there is good pressure when the booster pump is working its 84psi but only makes around 27-28 litres per hour. yes theres good flow cuming from the waste, dont know how much tho.

when i changed these filters the pressure didnt rise again as if it dropped from the ones before. so do you think it could b a membrane? as i have never had the TDS out of the RO below 24 the tap tds is around 380 at the moment

I would expect 8ppm at the very most coming from the RO with a tap reading of 380ppm, and a water pressure of 84psi, and I would expect at least 40L per minute at that pressure as well. I am sure though that there was a post a few weeks ago regarding something similar, but I can't remember how it panned out, as I took a back seat as I was not familiar with the Purefreedom set up.

It could be a dodgy membrane, it has been know for them to not function properly from new. I would test the water coming from each individual one to see if one has a much higher reading from the rest, and if so you can replace the faulty membrane. It wouldn't do any harm to phone up the company with the readings you have, and see if they are normal.

Peter

« **Reply #14 on:** April 18, 2008, 02:48:46 pm »

Quote from: foxman on April 18, 2008, 02:43:27 pm

Quote from: dave0123 on April 18, 2008, 10:58:23 am
Hi Peter,

No its not a merlin its 300GPD Purefreedom RO, there is good pressure when the booster pump is working its 84psi but only makes around 27-28 litres per hour. yes theres good flow cuming from the waste, dont know how much tho.

when i changed these filters the pressure didnt rise again as if it dropped from the ones before. so do you think it could b a membrane? as i have never had the TDS out of the RO below 24 the tap tds is around 380 at the moment

I've heard so many complaints about these RO's. It sounds like it's just a cheap chinese RO which just isn't up to much, with probably substandard membranes and filters. Replace them with american made Osmonics membranes and you should have no problems.

I would agree with Foxman (strange!) that it is best to stick to US made RO products as they are usually much higher quality and much more reliable.

« **Reply #15 on:** April 18, 2008, 03:56:56 pm »

I did ring up purefreedom before.

i said to them my TDS after RO in normal operation before i had the rising tds was 24 and they said thats about normal for 380tds and they said 25 to 29 lit per hour is good and is what they get. i think the tds should be lower like peter said even 12 or 14 id be happy with.

anyway they said monitor it over the weekend so if it rises as it could just be a cold spell and if it remains the high tds they will sort it out.

but its actully warmed up here neally in t-shirt yestaday!!

Quote

[ would test the water coming from each individual one to see if one has a much higher reading from the rest/quote]

thanks peter i will try that in a bit.

where can you get new membranes from? iv tried lookin at Alex's site put can only see ones for a 4040 and a merlin i think.

« **Reply #16 on:** April 18, 2008, 04:08:43 pm »

A decent 300GPD RO should be getting 380ppm down to 7-8ppm, at 24ppm I would say the membranes are on the way out.

As for 25 - 29 ltr per hour being 'good'.... 25 - 29 ltrs per hour equates to around 670ltrs in 24 hours. A stated 300GPD RO being 'good' should be making around 1000ltrs each day no problem.

« **Reply #17 on:** April 18, 2008, 04:16:36 pm »

I would also have to agree with Foxman, agreeing with me.

On a low pressure you would expect less than 300gpd, but with your pressure you should get at least, or more than 300gpd. Did you tell the company that you were using a booster pump?

I had someones 300gpd system the other week and it produced just over 1L per minute, the water pressure was 140psi though.

Peter

« **Reply #18 on:** April 18, 2008, 04:21:51 pm »

Yer i told them everything that i had a booster pump and the boosted pressure being 84psi

I said to them that i think its the membranes and i had some advice from you guys

because i have just replaced the prefilters yestaday. they must just be crap membranes as there only just hit three months old lol.

i will test the membranes like you said peter it has to be them? because theres nothing else left of the RO if not lol.

« **Reply #19 on:** April 18, 2008, 04:32:11 pm »

Like I said I have come across faulty ones from new, and they have been filmtec membranes. I have had problems with them as well when they used to come without being sealed in a bag, as they are not supposed to dry out.

Test them individually then you will know for sure. Let us now how you get on.

Peter

« **Reply #20 on:** April 18, 2008, 04:45:59 pm »

Thanks Peter,

I will test them could be later on today or early morning, let you know what i find

« **Reply #21 on:** April 18, 2008, 04:52:40 pm »

Hi Dave,

Hows work mate?

« **Reply #22 on:** April 18, 2008, 04:54:13 pm »

Fine thanks keepin busy.

Yours?? what area do you work in these days? i keep trying to look out for you.. but dont no what your driving these days

« **Reply #23 on:** April 18, 2008, 05:15:57 pm »

I'm all over at the moment and I drive something different all the time. Some days I go out in the blue focus and others I go out in my sprinter van, some days I have my magnetic signs on, some times I don't. Depends what work I have on.

« **Reply #24 on:** April 18, 2008, 06:44:38 pm »

how do you test a van mounted 4040 ?

I seem to be having some issues at the moment I would like to know how to test if the membrane is dying or not.

Ian

« **Reply #25 on:** April 19, 2008, 12:30:00 pm »

I have just tested my membranes i dont no if i did it in order but

the TDS readings from all three were 138, 288, 54 then out of the RO is (52)

thats without the booster pump running or it would be 37 out of the ro.

am sure that was the right connections i was testing off as the water was dripping out not shooting out accross the path like the entry side after pre filters.

« **Reply #26 on:** April 19, 2008, 03:17:08 pm »

Dave what you want to do is take the reading from each membrane the side with the two outlets. If you look at the membrane the side without the big screw cap on it. You will see on each membrane 2 separate outlets, one will be nearer the middle and one will be nearer the outside of the housing. It is the ones nearer the middle you want to take the reading from.

Peter

« **Reply #27 on:** April 19, 2008, 03:20:24 pm »

Ok thanks Peter

i will go and dot that now

« **Reply #28 on:** April 19, 2008, 03:43:46 pm »

Hi Peter

just tested that without the booster pump on again and the results are

93, 141, 83, and out of the RO 54

Dave

« **Reply #29 on:** April 19, 2008, 04:29:05 pm »

Sorry Dave, but the readings don't make sense, the individual reading would have to be much the same as the overall readings out the 3 membranes at once. And how is the reading out the RO now 54?

What I was telling you to test is the readings from the individual membranes, one at a time.

If you want me to try and explain it on the phone, you can call me on 01506 856390 or 07751 964 450 anytime. Well not in the middle of the night though.

Peter

« **Reply #30 on:** April 19, 2008, 04:43:16 pm »

i have read all the three membranes seprate disconnected 1 took test same as the other 2 and thats what readings came back there only 10 between 2of them and 1 high one?

then once i done that i tested the output of the ro it said 54 if i have the booster pump running its about 35 out of the ro because the tds rises.

« **Reply #31 on:** April 19, 2008, 04:53:43 pm »

You would have to have it connected when you take the reading. Take the pipe from the prefilters and put it into one membrane at a time, as you do it have the waste from the membrane going through the restricter, and the take the reading from the product pipe as it is flowing from the waste. Do this with each one.

There is definitely something wrong if the readings coming from the RO without the booster is 54.

Peter

« **Reply #32 on:** April 19, 2008, 04:59:47 pm »

OK i will do that,

the restrictor? what actully is that? or do i just need to change the pre filter pipe to each one and take a reading out the other end?

« **Reply #33 on:** April 19, 2008, 06:01:08 pm »

well i dont no what the hell is going on tbh

peter those results were

65, 55, 140

« **Reply #34 on:** April 19, 2008, 07:26:09 pm »

am that close to chucking this hole thing in the bin

seriously anoying me now

i done what was said above but thats what the ready come out as.