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UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: MJH on February 27, 2007, 01:37:56 pm

Title: DI BEFORE OR AFTER PUMP??
Post by: MJH on February 27, 2007, 01:37:56 pm

i am currently installing a 4040 ro system in my new van and am wondering what order the pump and di canister should go, i believe it is pump then di but just wanted to confirm for sure, i have looked through the other posts and can not pin-point this!!
Sorry in advance if this is a daft question. ::)

Title: Re: DI BEFORE OR AFTER PUMP??
Post by: 24-7 S C Services on February 27, 2007, 03:04:20 pm

Hi Matt

Di is after the pump mate, this eliminates any contamination it may pick up from the pump.

Hope that helps

Andrew

Title: Re: DI BEFORE OR AFTER PUMP??
Post by: MJH on February 27, 2007, 03:09:10 pm

Thanks for that Andrew i thought it was the case!! i am sure i read on another post someone had done it differently.
All the best matt

Title: Re: DI BEFORE OR AFTER PUMP??
Post by: Davew on February 27, 2007, 03:59:40 pm

Done mine before pump seems ok. Someone said they should not be pressurised, tds reading zero.

Title: Re: DI BEFORE OR AFTER PUMP??
Post by: MJH on February 27, 2007, 04:33:44 pm

i thought i had seen it somewhere, just wasn't sure which is best, di after pump seems logical!

Title: Re: DI BEFORE OR AFTER PUMP??
Post by: Davew on February 27, 2007, 04:52:14 pm

Jim123 where are you?

Title: Re: DI BEFORE OR AFTER PUMP??
Post by: JM123 on February 27, 2007, 04:54:47 pm

Most people have the di after the pump however we set our systems up so the di is before the pump.. This has a few advantages.

1 - when running 2 pumps there is no interference, that is each pump and reel line is completely independant of the other.
2 - it eliminates the risk of creep stress fracturing of the di vessel (creep stress is caused by stress on a body - in this case the vessel - over a period of time.

Title: Re: DI BEFORE OR AFTER PUMP??
Post by: JM123 on February 27, 2007, 04:55:24 pm

dave I'm here mate - I'm never far away 8)

Title: Re: DI BEFORE OR AFTER PUMP??
Post by: Davew on February 27, 2007, 05:12:02 pm

Blimey that was quick!

Title: Re: DI BEFORE OR AFTER PUMP??
Post by: JM123 on February 27, 2007, 05:15:15 pm

I know

Title: Re: DI BEFORE OR AFTER PUMP??
Post by: edd on February 27, 2007, 07:43:21 pm

mine is di into the tank then the pump then brush still 000ppm one year later all the water in the tank is pure