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UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: Perfect Windows on November 19, 2011, 12:41:40 pm

Title: What is your 4040 RO pure:waste ratio [POLL]
Post by: Perfect Windows on November 19, 2011, 12:41:40 pm

Pretty much as described; if you use a 4040, how much waste are you producing and do you think it has an effect on the life of your membrane?

Vin

Title: Re: What is your 4040 RO pure:waste ratio [POLL]
Post by: SPE on November 19, 2011, 02:36:55 pm

I have an hf5 and my waste/pure is set 50/50
I dont have the pressure boosted and I recently replaced the membrane, the previous one lasted about 2 years.
I think the ratio I'm using definately played a part in this but I can produce 650 ltrs at this ratio in about 3 hours without a pump ,
financially I'm ok with this , if I get 2 years use from each membrane
Simon

Title: Re: What is your 4040 RO pure:waste ratio [POLL]
Post by: AS Window Cleaning on November 19, 2011, 03:17:38 pm

used to be 40 pure to 60 waste, as on metre, but now not metered so about 30 pure to 70 waste.

Title: Re: What is your 4040 RO pure:waste ratio [POLL]
Post by: Perfect Windows on November 20, 2011, 09:12:34 am

The guys who run 1:1 - what sort of life are you getting out of a membrane?

Vin

Title: Re: What is your 4040 RO pure:waste ratio [POLL]
Post by: Lee Pryor on November 20, 2011, 09:57:48 am

mine is 50/50 and the membranes have lasted near;y 4 years. the secret to long life is good pre filters changed regularly, use a softener and flush for 15 - 20 min a a few times a week.

Title: Re: What is your 4040 RO pure:waste ratio [POLL]
Post by: AS Window Cleaning on November 20, 2011, 08:04:24 pm

apparently using booster pump also lessens life expectancy of membrane..... tho think that depends also on water flow from tap