[sham33]

Has any one owned both it would be good to know if its worth the upgrade. Thx.

[Lee GLS]

Smudger has had both, he's the man to talk to.

[Dan French]

Hi a Merlin produces 720 GPD and a 4040 produces 2300 GPD, therefore a 4040 will be faster, both require good constant water pressure the higher the better

[sham33]

Ok thanks sounds a lot faster than what i have now.

[Window Washers]

The answer is yes it is and less waste had a merlin shocking amounts it wastes

[sham33]

The answer is yes it is and less waste had a merlin shocking amounts it wastes

Yeah that is one of the other main reasons too especially the way things are right now.

[Steve peel]

the merlin is a domestic pure water system thats what it was made for but many do use it for window cleaning  with wfp , however the 40/40 ro is the one to use if you have a lot of work and much cheaper to run and with the correct pre -filtration will last you for years, mine is over 12 years old and still the same membrane and its 169ppm in this area which is medium hard.
flush out ro's twice a week with pure water is the answer, just connect your outlet hose to your fill port turn back ro numpty fully anti clockwise switch pump on fuul blast (  As if cleaning windows )
and flush for 10 mins this will clean all the crap in your membrane and always have pre filtration before ro,s eg carbon filter, sediment filter water softener filter (if in hard water area, and back wash this one regular) then before the water comes to pump use a DI resin filter to give 100% pure water with a tds of 0.00
follow this guideline and it will last you forever.

[best]

the merlin is a domestic pure water system thats what it was made for but many do use it for window cleaning  with wfp , however the 40/40 ro is the one to use if you have a lot of work and much cheaper to run and with the correct pre -filtration will last you for years, mine is over 12 years old and still the same membrane and its 169ppm in this area which is medium hard.
flush out ro's twice a week with pure water is the answer, just connect your outlet hose to your fill port turn back ro numpty fully anti clockwise switch pump on fuul blast (  As if cleaning windows )
and flush for 10 mins this will clean all the crap in your membrane and always have pre filtration before ro,s eg carbon filter, sediment filter water softener filter (if in hard water area, and back wash this one regular) then before the water comes to pump use a DI resin filter to give 100% pure water with a tds of 0.00
follow this guideline and it will last you forever.

could you clarify the ro flush?
when you say "connect your outlet hose". is this your ro outlet hose or from your van

[Cliff perkins]

Can you flush a merlin and how please

[Spruce]

Can you flush a merlin and how please

I don't have a Merlin but looked into it quite extensively a couple of years back.

Merlin actually do a flushing tank that will automatically back flush your membranes every time the unit stops filtering.

http://www.gapswater.co.uk/acatalog/GE-Merlin-flushing-tank-4.html

Spruce

[Rogue Trader]

4040 produces more pure water faster than a merlin but the ratio of waste between a merlin and a 4040 is the same - for longevity of a 4040 it should be 70/30 ratio waste/pure which is about the same as a merlin. I have 2 4040's running in line and when doing this it is ok for waste ratio to be 50/50

[www.com]

Can you flush a merlin and how please

I don't have a Merlin but looked into it quite extensively a couple of years back.

Merlin actually do a flushing tank that will automatically back flush your membranes every time the unit stops filtering.

http://www.gapswater.co.uk/acatalog/GE-Merlin-flushing-tank-4.html

Spruce

No it doesn't. You can't back flush a Merlin.

[alanwilson]

Uh yes you can.

Top port on merlin is for backflushing. Uses pressure to force permeate water back through the membrane fibres releasing trapped salts down the drain.

With a 4040 you are only flushing tap water over the top of the membrane to force salts off the surface of the membrane and Down the drain

[Window Washers]

Uh yes you can.

Top port on merlin is for backflushing. Uses pressure to force permeate water back through the membrane fibres releasing trapped salts down the drain.

With a 4040 you are only flushing tap water over the top of the membrane to force salts off the surface of the membrane and Down the drain

what is permeate water ? thats a new one for me ( I love to learn )

[www.com]

Uh yes you can.

Top port on merlin is for backflushing. Uses pressure to force permeate water back through the membrane fibres releasing trapped salts down the drain.

With a 4040 you are only flushing tap water over the top of the membrane to force salts off the surface of the membrane and Down the drain

No you cant. The top port is for the flush tank.

You can't do it with the flush tank, that is only for TDS spike when turning the Merlin on after stand by.

[alanwilson]

No it's not, when you close the permeate (pure water) faucet the permeate in the bladder tank blows backwards over the membranes and out through the waste. This is to prevent salt saturation of the membranes.

You can connect some 1/4 Jg piping to your pole hose, push the end into the top port, and turn the pump on to backflushing your membranes.

We have been doing this for about 5 years, original membranes (it's at my sons house - 2500 to 3000 ltrs pure a week, tds in 135 tds out 11

[Smudger]

to my knowledge merlin has no back flush - the tank is to stop TDS spikes when used for drinking water - which you get with any ro if left for a few days.

i had my Merlin running at over 100 ltrs ph  - my 4040 runs just slightly faster but it came with the van, so i don't know what version membrane it is and i'm due to change the pre filters

the biggest advantage the 4040 has is less waste and better pure the merlin used to be 19 the 4040 is 6  but
the merlin served me well for 3 years and easily produced enough water for 2 vans ( 800 ltrs ) every day

Darran

[Flash..]

I back flush my merlin by filling a barrel with pure water then pumping it back through the Merlin using my booster pump using the top port as alanwilson describes.

[www.com]

Guys, this is completely made up! All your doing is flushing the water your putting in directly to waste! It isn't touching the membranes!

No where in the Merlin manual does it say to do this, doing this will make no difference to your membrane life.

[Smudger]

Guys, this is completely made up! All your doing is flushing the water your putting in directly to waste! It isn't touching the membranes!

No where in the Merlin manual does it say to do this, doing this will make no difference to your membrane life.

well said