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UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: nat on July 14, 2007, 04:00:55 pm

Title: i need help on building a static RO system for filling into vans
Post by: nat on July 14, 2007, 04:00:55 pm

I will be moving into my new house on Friday and i want to build a static system capable of holding 2000 litres at a time

firstly i have been lucky up till now that i have only been on water rates, i will now be on a water meter so i need to recycle all the waste water in order to get the most out of all the water.

has anyone built one of these? do you have any pics and/or diagrams?? maybe a list of all parts needed would be great???

any help would be very appreciated

thanks in advance

Title: Re: i need help on building a static RO system for filling into vans
Post by: JM123 on July 14, 2007, 04:15:07 pm

Hi Nat

We custom build static ro systems to suit individual needs.  We can build you a system to radically reduce waste water while not harming or fouling membrane elements.

E-mail me to discuss your requirements aquapolesystems@hotmail.co.uk

Title: Re: i need help on building a static RO system for filling into vans
Post by: nat on July 14, 2007, 04:18:49 pm

Hi Jm123

thanks for the reply but really i'm gonna have a go of building my own to save on cost. what do you use to reduce waste water?

thanks

Title: Re: i need help on building a static RO system for filling into vans
Post by: JM123 on July 14, 2007, 04:20:49 pm

Hi Nat

Not a problem, have you got an ro system already or are you going to build one from scratch?

Title: Re: i need help on building a static RO system for filling into vans
Post by: nat on July 14, 2007, 04:31:13 pm

yes i have an ro system already that fills into the vans tanks

it consists of (excuse me but i don't know the proper names)

1x long white ro same as ionics supply
2x short blue filters approx 10 inches in height
2x 25 litre DI vessels

hope this makes sense

Title: Re: i need help on building a static RO system for filling into vans
Post by: JM123 on July 14, 2007, 04:39:50 pm

No problem - by the sounds of it you have a standard 4040 with blue pentek housings.

What is your water pressure like?
Have the prefilters been changed recently?
Do you know the inlet tds at the new house?

Title: Re: i need help on building a static RO system for filling into vans
Post by: nat on July 14, 2007, 04:42:21 pm

i live in a very hard water area and i believe it to be around 250-300 ppm. i don't know what the water pressure is like at the new house but the one i'm in currently is very good taking about 1hour per 100 litres purifeied

Title: Re: i need help on building a static RO system for filling into vans
Post by: JM123 on July 14, 2007, 05:01:48 pm

ok, if you can check the inlet pressure at the new house do it as soon as you can.  Inlet pressure is what will determine whether you need a booster pump or not. 

There are ways to keep recycling the waste water but it is a futile exercise - gradually the inlet tds rises so high that it starts to foul the membrane.  The best thing to do is reduce the waste water enough to save on water bills while not fouling the membrane.  A booster pump will allow you to do this.  Also adding another membrane will reduce waste water.

Title: Re: i need help on building a static RO system for filling into vans
Post by: chris@c.m.s on July 14, 2007, 05:40:03 pm

Quote from: JM123 on July 14, 2007, 05:01:48 pm

  The best thing to do is reduce the waste water enough to save on water bills while not fouling the membrane.  A booster pump will allow you to do this.

What is a safe pure to waste ration with a pumped 4040? I havent changed mine since I got it so I must be wasteing water as well then.   

Title: Re: i need help on building a static RO system for filling into vans
Post by: JM123 on July 14, 2007, 06:15:28 pm

determining a safe recovery ratio is dependant on input tds and flow rate out of the membrane.

the higher the tds the lower the recovery = more waste

the lower the flow rate the lower the recovery = more waste.

With a booster pump and assuming input tds of 300ppm you would be safe to recover about 70%, some have their systems set at a higher recovery than this.  Bear in mind though the more you recovery the quicker the membrane will foul.

Title: Re: i need help on building a static RO system for filling into vans
Post by: nat on July 14, 2007, 06:23:55 pm

JM you sound like you know what your doing ;D

Im confused already ???

i think i'll wait till i'm in there next week when i can check the pressure, once i know i'll post again to see what the best way forward is

thanks for your comments ;)

Title: Re: i need help on building a static RO system for filling into vans
Post by: chris@c.m.s on July 14, 2007, 06:36:04 pm

Thanks JM I am wasting a lot of water then  ::)

Title: Re: i need help on building a static RO system for filling into vans
Post by: JM123 on July 14, 2007, 09:40:13 pm

perhaps but I wouldn't worry about that - trying to get too much recovery from a membrane will kill it much faster and therefore need replacing much sooner