[supernova77]

Hi All,

My Merlin has slowed water production right down over the last week or so...

I obviously need to change filters - Do you think just changing the two pre-filters will do the trick or do you think I need to replace the membrane as well? I haven't changed anything on it within the last 12 - 18 months...

Thanks,
Andy

[GB Window Cleaning]

It could be your pressure coming from the tap?!

[smearo]

I haven't changed anything on my merlin in 4yrs and still
Producing about 19ppm before resin

[Smudger]

I would defo change the pre - filter in the unit and any other filters you are using before the unit

failing that you could remove the membranes wash out the casing incase there is a blockage in a channel
and re assemble

Darran

[ben M]

I haven't changed anything on my merlin in 4yrs and still
Producing about 19ppm before resin

what is your tds before RO?

[SPE]

Hi All,

My Merlin has slowed water production right down over the last week or so...

I obviously need to change filters - Do you think just changing the two pre-filters will do the trick or do you think I need to replace the membrane as well? I haven't changed anything on it within the last 12 - 18 months...

Thanks,
Andy

Andy, the merln has one pre flter and two membranes, when I had one and the pre filter needed changing I decided to remove the pre filter from the housing (first one) and leave it empty.
I then bought two 10" housings and sediment and carbon block filters that I ran inline before the ro. Standard 10" pre filters are cheaper than merln ones and readily available from all suppliers. hence why I did it.
Gardiners now sell a 3 in 1 pre filter thats fits a standard 10" housing and so does away with the need for 2 or 3 stages and you need only 1 housing, apparantly this lasts 3 times longer before the need to change it and will improve the pressure to the ro.
 Ofcourse your membranes could already be shot but the advice to take them out and wash them off and check for blocked channels wll cost you nothing, 2 new membranes would be a lot more expensive to replace though than a new pre filter whether it be a merlin one or 10" but you won't know that until you eliminate the pre filter as the fault anyhow.

Just my opinion, and you may be very happy with a merlin and it suits your circumstances, but I never liked mine, found it very wasteful on water and quite inconsistent with regards to output and high tds.
When my membranes had finally died I made the decision to ditch it in favour of a 4040 rather than shell out on new memranes. It cost me more to set up but it was the right decision  

Hope my advice is of help
Good luck

Simon

[monkeyman]

Hi Andy I had the same problem this past weekend,changed the carbon prefilter and it was as good as new

[supernova77]

Andy, the merln has one pre flter and two membranes, when I had one and the pre filter needed changing I decided to remove the pre filter from the housing (first one) and leave it empty.
I then bought two 10" housings and sediment and carbon block filters that I ran inline before the ro. Standard 10" pre filters are cheaper than merln ones and readily available from all suppliers. hence why I did it.
Gardiners now sell a 3 in 1 pre filter thats fits a standard 10" housing and so does away with the need for 2 or 3 stages and you need only 1 housing, apparantly this lasts 3 times longer before the need to change it and will improve the pressure to the ro.
 Ofcourse your membranes could already be shot but the advice to take them out and wash them off and check for blocked channels wll cost you nothing, 2 new membranes would be a lot more expensive to replace though than a new pre filter whether it be a merlin one or 10" but you won't know that until you eliminate the pre filter as the fault anyhow.

Just my opinion, and you may be very happy with a merlin and it suits your circumstances, but I never liked mine, found it very wasteful on water and quite inconsistent with regards to output and high tds.
When my membranes had finally died I made the decision to ditch it in favour of a 4040 rather than shell out on new memranes. It cost me more to set up but it was the right decision  Wink

Hope my advice is of help
Good luck

Simon

Thanks for the advise 

I've been happy with the Merlin so far - It does the job... I'll give it a good clean out and see what happens.

I would like a 4040, but have new poles etc... to buy at the moment - £££   

[supernova77]

Hi Andy I had the same problem this past weekend,changed the carbon prefilter and it was as good as new Smiley

Cool - Probably worth just trying that first then.

Andy 

[Avo]

I would defo change the pre - filter in the unit and any other filters you are using before the unit

failing that you could remove the membranes wash out the casing incase there is a blockage in a channel
and re assemble

Darran

what he said  try pre filter 1st moving on the the membrane afters

[Spruce]

I wouldn't advise washing/spraying off the membranes with tap water - its full of chlorine. If you must wash them off, use the water from your van with a hose and nozzle.

[rosskesava]

I haven't changed anything on my merlin in 4yrs and still
Producing about 19ppm before resin

19 tds? Mine is always about 55 ppm. With new filters (all 3) it goes down to about 25 ppm but after about 4 000 - 5 000 ltrs it goes back to 55 ppm. After about a year or so, I know when to change the filters because the tds shoots up within a few thousand litres to over 120.

The tap water here is about the 300 mark.

Do you use a booster pump or just mains pressure?

[smearo]

My tds b4 merlin is around the 280 mark.....
Rossekva - yes I have a booster which brings pressure
Up to 80psi ish 

[supernova77]

Happy to report that this morning I changed just the pre-filter in my Merlin and the water is flowing as normal again.

Andy 

[Avo]

Another happy ending 

[Slash]

My tds b4 merlin is around the 280 mark.....
Rossekva - yes I have a booster which brings pressure
Up to 80psi ish  
[/quote


What booster pump do you use,
Thanks

[smearo]

@slash its a draper mate....

[Slash]

Great stuff as your local to me.