Clean It Up

UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: geefree on December 15, 2009, 05:54:09 pm

Title: How do you know when to.....
Post by: geefree on December 15, 2009, 05:54:09 pm: How do you know when its time to Change the membranes on a 300gpd ro man....??................ i change the filters regular..ish.

but never changed membranes.

Cheers.
Title: Re: How do you know when to.....
Post by: geefree on December 15, 2009, 07:18:10 pm: ;)
Title: Re: How do you know when to.....
Post by: Window Washers on December 15, 2009, 07:20:17 pm: you tds will rise, and will not go down
Title: Re: How do you know when to.....
Post by: [GQC] Tim on December 15, 2009, 07:22:09 pm: Quote from: windowwashers on December 15, 2009, 07:20:17 pm
you tds will rise, and will not go down

Yea, no matter if you change prefilters or not.
Title: Re: How do you know when to.....
Post by: geefree on December 15, 2009, 07:29:13 pm: thanks, dont know what they look like, are they pricey?
Title: Re: How do you know when to.....
Post by: p1w1 on December 15, 2009, 08:08:32 pm: think about £120 for the 3 membranes, used to use ro man in the past for them, but get them from gardiners now..dont bother wasting your time buying the cheap imports, waste of money.

paul
Title: Re: How do you know when to.....
Post by: geefree on December 15, 2009, 08:42:17 pm: gulp :o

thanks ;)
Title: Re: How do you know when to.....
Post by: mark dew on December 15, 2009, 09:00:32 pm: Quote from: Gazzasp8 on December 15, 2009, 08:42:17 pm
gulp :o

thanks ;)

I wouldn't worry too much gazza, my 300gpd ro-man ro has had 1 filter change only in the last 3 1/2 years. No membranes.
It gets flushed very well and regular.
I am not on a water meter. ;D
Title: Re: How do you know when to.....
Post by: cockney rebel on December 15, 2009, 09:09:54 pm: Quote from: Gazzasp8 on December 15, 2009, 05:54:09 pm
How do you know when its time to Change the membranes on a 300gpd ro man....??................ i change the filters regular..ish.

but never changed membranes.

Cheers.
Just bought 3 today. £27 each from The Cleaning Spot. Usually you should change them every 2-3 years. ;D
Title: Re: How do you know when to.....
Post by: p1w1 on December 15, 2009, 09:17:17 pm: Quote from: cockney rebel on December 15, 2009, 09:09:54 pm
Quote from: Gazzasp8 on December 15, 2009, 05:54:09 pm
How do you know when its time to Change the membranes on a 300gpd ro man....??................ i change the filters regular..ish.

but never changed membranes.

Cheers.
Just bought 3 today. £27 each from The Cleaning Spot. Usually you should change them every 2-3 years. ;D
thats a good price.you have a link

paul
Title: Re: How do you know when to.....
Post by: geefree on December 15, 2009, 09:31:48 pm: thanks, i dont flush very often... how long do you flush them for?

and how often should i ?
Title: Re: How do you know when to.....
Post by: p1w1 on December 15, 2009, 09:57:56 pm: Quote from: cockney rebel on December 15, 2009, 09:09:54 pm
Quote from: Gazzasp8 on December 15, 2009, 05:54:09 pm
How do you know when its time to Change the membranes on a 300gpd ro man....??................ i change the filters regular..ish.

but never changed membranes.

Cheers.
Just bought 3 today. £27 each from The Cleaning Spot. Usually you should change them every 2-3 years. ;D

plus vat and delivery ;)
Title: Re: How do you know when to.....
Post by: [GQC] Tim on December 15, 2009, 10:07:28 pm: Quote from: Gazzasp8 on December 15, 2009, 09:31:48 pm
thanks, i dont flush very often... how long do you flush them for?

and how often should i ?

Once a day for about 15min, then once a week a little longer. Although this entirely depends on how much water you produce a day. I produce about 350l a day.

RO man I think recommends flushing it for half an hour at least before every fill or something along those lines.
Title: Re: How do you know when to.....
Post by: mark dew on December 15, 2009, 10:07:44 pm: Quote from: Gazzasp8 on December 15, 2009, 09:31:48 pm
thanks, i dont flush very often... how long do you flush them for?

and how often should i ?

Depends if you are on a meter i suppose?
But i flush after production for 1/2 hour or so everyday.
I also have a booster pump which might help as it runs more efficiently with it.
Mine is a ro-man booster pump and 300gpd ro, which i bought from gardiners in march 06.
Like i said, same membranes and 2nd set of filters. I produce between 1200 - 2000 litres per week.
Title: Re: How do you know when to.....
Post by: leapstallbuildings on December 15, 2009, 10:14:08 pm: Quote from: Gazzasp8 on December 15, 2009, 05:54:09 pm
How do you know when its time to Change the membranes on a 300gpd ro man....??................ i change the filters regular..ish.

but never changed membranes.

Cheers.

As Windowwashers said, the TDS will rise. The other thing that happens is that the production rate will slow down. Both of these events are well outside the normal fluctuations that you might expect.