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UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: Mr Sparkle on July 20, 2014, 06:14:18 pm

Title: What should I be getting
Post by: Mr Sparkle on July 20, 2014, 06:14:18 pm
Hi guys my tds reading straight out of my merlin 40/40 is reading 0.52 tds!
I'm sure it should be lower than that?
What should I be getting?
Do I need to change anything if so what needs changing?
Thanks guys
Title: Re: What should I be getting
Post by: 8weekly on July 20, 2014, 06:18:24 pm
What is your tap water tds? Typically a Merlin will remove 90%.
Title: Re: What should I be getting
Post by: Mr Sparkle on July 20, 2014, 07:17:25 pm
Tap water is high here it's coming out at around 280 tds
Title: Re: What should I be getting
Post by: Smudger on July 20, 2014, 07:22:23 pm
That's not an horrific tap water TDS your Merlin should be able to knock this down to between 10 and 15 TDS provided you have enough pressure are you using a booster pump ??

Darran
Title: Re: What should I be getting
Post by: 8weekly on July 20, 2014, 07:25:49 pm
Quote from: Smudger on July 20, 2014, 07:22:23 pm
That's not an horrific tap water TDS your Merlin should be able to knock this down to between 10 and 15 TDS provided you have enough pressure are you using a booster pump ??

Darran
Really? On 80psi I only got 280 tds down to 29 with new membranes and filter. My research was that this was about right for a Merlin.
Title: Re: What should I be getting
Post by: Mr Sparkle on July 20, 2014, 07:29:01 pm
No haven't got a booster pump,
Will it make a big difference using a booster pump?
Title: Re: What should I be getting
Post by: Smudger on July 20, 2014, 07:44:55 pm
8w - well at 90% 280 should yield a TDS of 28

Using a booster pump
( http://www.anglianpumping.com/products/dab-jet-pumps-230v )
I got my 340 TDS down to 11 with new membranes over a period of 2 years it crept up to 25

With the Merlin it's important to change the little pre filter every 4 to 6 months and if your making more than 50 ltrs per day you need to have 10 or 20 inch pre filters a sediment and carbon block

Darran
Title: Re: What should I be getting
Post by: 8weekly on July 20, 2014, 07:51:28 pm
Quote from: Smudger on July 20, 2014, 07:44:55 pm
8w - well at 90% 280 should yield a TDS of 28

Using a booster pump
( http://www.anglianpumping.com/products/dab-jet-pumps-230v )
I got my 340 TDS down to 11 with new membranes over a period of 2 years it crept up to 25

With the Merlin it's important to change the little pre filter every 4 to 6 months and if your making more than 50 ltrs per day you need to have 10 or 20 inch pre filters a sediment and carbon block

Darran
I have moved recently and am getting through resin at a ridiculous rate now as I am on much lower pressure. Which of those pumps did you go for? Was going to buy this one:

http://www.ebay.co.uk/itm/Clarke-1-Multi-Stage-Pump-CBM240-/310969992016?pt=UK_Hand_Tools_Equipment&hash=item4867418350
Title: Re: What should I be getting
Post by: Smudger on July 20, 2014, 08:06:11 pm
I'd have to check but sure it was the 82m second on menu £139.00

Been going 4 years, been frozen in the shed, run dry for six hours when the hose blew off, and run with boiling water when I forgot to set timer and tank solenoid shut off flow so pump ran with same water inside it for 3 hrs !!!

Btw you can buy these with a pressure switch to avoid all of the above problems 😄

Darran
Title: Re: What should I be getting
Post by: martin hulstone on July 20, 2014, 08:35:50 pm
clarke 240 e is the better pump think its 310 quid on ebay