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UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: jon007 on March 13, 2006, 08:43:19 pm

Title: Merlin RO Unit TDS reading?
Post by: jon007 on March 13, 2006, 08:43:19 pm

Does anybody know the TDS reading after the water has been passed through the merlin ro unit? Also, how long roughly will it take to fill a 400l tank?

Title: Re: Melin RO Unit
Post by: Andrew McCann on March 13, 2006, 09:04:47 pm

Hi Jon and welcome to the forum. :)

This is a bit of a how long is a piece of string question to answer.

There are many factors that will determine TDS out. Such as.. TDS in..  Water pressure.. temperature etc.

The Merlin likes decent water pressure (60 PSI plus) Much lower and it is pretty inefficient.  It is fine with good water pressure and a good idea is to add a carbon prefilter to pass the water through before the Merlin. Some also add a softener unit as well.

These factors will aslo affect the output rate so how long to fill a tank is a bit hard to give an answer to.  I am sure some merlin users will come along soon with their own experience to help you though :)

Cheers

Andrew

Title: Re: Merlin RO Unit TDS reading?
Post by: jon007 on March 13, 2006, 09:12:47 pm

Cheers Andrew

Title: Re: Merlin RO Unit TDS reading?
Post by: Alex Gardiner on March 14, 2006, 08:02:31 am

Hi There,

To give you an example,

on 100psi mains with an 80tds reading it will chuck out 175 litres an hour at about 002-004 TDS

Hope this helps

Alex

Title: Re: Merlin RO Unit TDS reading?
Post by: jon007 on March 14, 2006, 08:28:17 am

Thanks Alex

Title: Re: Merlin RO Unit TDS reading?
Post by: Browns Associated cleaners on March 14, 2006, 09:41:25 am

i have a carbon pre filter , the tds going in is about 230 i also have a merlin booster pump on the inlet  produces about one litre a minute at 8 tds  ive been told by a ro expert that this is the best i can get with the setup i have hope this helps
browns

Title: Re: Merlin RO Unit TDS reading?
Post by: Filllllll on March 14, 2006, 10:48:25 am

Hi Jon.

My Merlin fills my 400 litre tank in about 3 hours.

1 litre every 43 seconds.

Tap pressure is 65.

TDS in is 430.      TDS out is 21.

No softener .

Cheers, Filllllll

Title: Re: Merlin RO Unit TDS reading?
Post by: jon007 on March 14, 2006, 07:48:32 pm

Hi, thanks
If I use the merlin with a DI to do the final polish, will it be economical?

Title: Re: Merlin RO Unit TDS reading?
Post by: Andrew McCann on March 14, 2006, 09:32:07 pm

Hi again Jon.

If it is set up right with carbon prefilter and very good water pressure or a booster pump it will do fine. Of course a lot depends on your TDS in. Set up well I reckon 95% ish  TDS removal is about the best you will get.

Hope this helps

Andrew