[Andrew McCann]

I have a bit of spare time on my hands so I am going to use a bit of it to try and help folks out with looking after RO systems.

There are no end of threads on here basically saying people have changed their RO prefilters and that their TDS readings out of the DI have gone up. This is usually because the DI has been left attached to the RO when first running water through the RO with the new filters in. I am talking about the prefilters here.

There will be a large amount of "fines" in the water out of the RO for the first few mins of running. These come from the carbon filters. They will stop when they have been washed away but if left to get into the DI will send the reading high and probably finish off whatever life was left in the resin.

Best practice is to disconnect the DI, put the new prefilters in then run the RO on flush mode for 10 mins then in product mode for another 10. Pop the DI back on and you should be fine.

Do exactly the same if you change membranes but run the RO in product mode for 30 mins again disconnected from the DI.

Hope this helps

Andrew

[karygate]

how much is a merlin or similar cost to run in comparisom to a 200/300 gpd ro unit.

[Sure Cleaning]

Hi Andrew,

Several days ago my sediment filter turned completly brown, on inspecting it it was covered in thick brown gunge like mud.  I changed it along with the other two filters and again after a day or so filter is completely covered in brown gunge.

I have been running this ro system for 4 years and have never ever seen this before...any ideas???

The outside tap is a spur off my kitchen tap and we have not noticed any thing wrong with our water supply. The hose runs directly from outside tap to RO system.

Any help much appreciated.

Steve G

[jaykie]

Here you go as requested by birdymiller

[birdymiller]

Cheers mate how did you do that?

Andrew this is the ro system that came with my pure freedom trolley. Has it got a di on it, it gives a tds000 i produce around 600 litres of pure water a week, what if anything do i need to replace to keep it running at 000. I get the odd run and spotting(not a lot) and was wondering if it was because the di was not polishing the water off. I cant find a flushing lever but there is one that says drain if this how to flush it every week for a few mins. Cheers in advance and hope you carry on helping out whilst you are on the mend.

[jeff1]

Position for water production


Position for flushing

[birdymiller]

Cheers jeff ill flush it later

[birdymiller]

any chance you can look at my ro picture andrew and give me some tips

[birdymiller]

I think ive been doing it wrong. I think for the past 4 months i have been flushing my ro instead of having it on water production. Can this be possible beacuase mt tds has been 000 but changed position of tap like jeff said and my waste water has slowed down. Im still producing tds000. What do you reckon. have i knackered anything apart from emptying local reservoirs every week. I thought i wasnt producing that much and there was alot of waste. oops :

[groundhog]

Thankyou Andrew, that was some good information. My ro seems to have slowed right up recently, and is now only managing to produce about 300ltrs in a 12 hour period! I have changed the prefilters and the resin, but it has made no difference to the speed of production, I also have a pump on the system. My ro is over 3 years old now, is it time to invest in a new ro, or is there something I can do to increase the production speed? 

[Andrew McCann]

Sorry for the delay in answering. I had a bit of a bad day yesterday.

Anyway one at a time.

Paveclean: You have had some very dirty water go through your system. It's usually caused by work on the mains somewhere near you. It should get better when the work is finished.

Birdymiller: lol You won't have damaged anything. I hope you aren't on a water meter 

Groundhog: If your pump is working properly it's probably time to change your membrane/s. I don't know what type of RO you have but for most 3 years life from membranes isn't bad at all. One other clue as to whether they are on the way out is a gradual rise in TDS out. So..  lower output and higher TDS out means new membranes are needed. Of course there could be a partial blockage somewhere in the RO so if you feel up to it you could strip it down and have a look.

Jeff:  Nicely manicured fingernails mate   

[birdymiller]

What about my ro andrew, has it got a di on it.

[groundhog]

Thanks Andrew, my system is an RO man 300, I will look into changing the membranes... sounds expensive!!! 

[Andrew McCann]

What about my ro andrew, has it got a di on it.

If you haven't got a seperate container for DI resin then yes it has.

Andrew

[birdymiller]

From my picture andrew(above) can you tell what kind of ro mine is and if it has a di what kind off maintenance i need to do to it. Its about 18 months old but has not been used that much apart from alot of flushing. Its never had anything replaced so how long should filters, membranes, etc last. Its has a clear filter where the water goes in with something brown inside it and then has 2 white filters dont konw what they all are

[Dean Taberner]

Hi Andrew,

Hope you are ok mate,

I bought a 300GPD RO system off you when you were at Adepta. The time has now come for me to change my pre-filters. The only problem is that I know nothing about where to buy them from or what to ask for. All that I know is that I need 3.

Are all pre-filters the same so I buy 3 of the same products or do I need different ones?

Thanks for any help,

Take care,

Dean.