[SeanK]

Mufcglen,
My last 4040 membrane lasted 6 years so that less than a pound a week, it takes my water down from around 250ppm
to between 4 and 8ppm.
With your TDS I cant see you getting any worse than these results maybe a little better.
I spend about £40 a year on pre filters.
I could easily get a year from a 11lt bottle of resin if I wanted to keep the water at Zero.
Over 5 years you will have spent over £3k and I'm talking around £800 with a far higher TDS.

[mufcglen]

Cheers guys good points and I have thought about doing it directly into van tank with no transfer tank,I have a transit with a 650 tank and plenty of room to fit a 4040 with prefilters but how long would it take to fill a tank like that doing the ro method?
I connect to the tap at the front of the house and it takes about 30 mins to fill up at moment.

[Shrek]

If it runs st 393 Ltrs per hour ... Then .... 1.5 hours for a 650 ltr tank?

[mufcglen]

That's not bad at all and suppose I could get a booster pump too if needed but if I could fill 500 litres-ish in less than 2 hours I'd be happy with that, is there any 4040 ro's that are better than others and I presume I'd need to have an outlet pipe on the van for waste water?
Any recommendations where to buy a 4040?

[jk999]

A 4040 ro would fill your 5to 650 ltr  tank in about 2hours maybe 3 ,having a 4040 ro  would save you quite a bit of money each year if tds is about 079

[Susan Dean (1stclean)]

using a bag every 4 weeks now ive changed the filters in the merlin , was down to a bag every 3 weeks we use around 3000lt aday

[colin bird]

Hi all , my tap water TDS is now 250 ppm , I changed resin on the 9th July , it's now gone upto 001ppm ( 1 litre vessel ) . At this rate I will be using 52 Ltrs a year , is this about right?
[/quote

My tds is 270 I work 6 hours a day  on the glass five days a week,I have a van mounted system with a 40 inch ro and I use 25 l of resin a year

[Shrek]

Hi all , my tap water TDS is now 250 ppm , I changed resin on the 9th July , it's now gone upto 001ppm ( 1 litre vessel ) . At this rate I will be using 52 Ltrs a year , is this about right?
[/quote

My tds is 270 I work 6 hours a day  on the glass five days a week,I have a van mounted system with a 40 inch ro and I use 25 l of resin a year

Cheers Colin , somethings not right then, what size DI vessel do you use?

[colin bird]

6l mate I normally get three months from onebottle,I change filters and resin at the same time,and flush system when I remember,probably once a month,.
Ro only last a year and has done for nine years,I get all my stuff from purefreedom

[jk999]

6l mate I normally get three months from onebottle,I change filters and resin at the same time,and flush system when I remember,probably once a month,.
Ro only last a year and has done for nine years,I get all my stuff from purefreedom

you have changed your membrane  once a year for nine years  wow

[colin bird]

6l mate I normally get three months from onebottle,I change filters and resin at the same time,and flush system when I remember,probably once a month,.
Ro only last a year and has done for nine years,I get all my stuff from purefreedom

you have changed your membrane  once a year for nine years  wow

Yes once a year,as the tds  starts rising quicker from the ro before it gets to the resin,after about 11 months,it used to concern me ,when others were gettin much more time out of there ro,but after 9 years I feel that's all the ro can do due to the tds

[Shrek]

Iv got a pure freedom ro , got the membranes from daqua, filters from gardiners and 1ltr di from pure freedom,  it's comes out of the RO at 002 then goes through resin , that's what I don't get why it's only lasting a week 

[colin bird]

Iv got a pure freedom ro , got the membranes from daqua, filters from gardiners and 1ltr di from pure freedom,  it's comes out of the RO at 002 then goes through resin , that's what I don't get why it's only lasting a week 

Even when my 40  40 ro is new it still comes out between 25 to 30 b4 resin but I always get three months out of  my 6l bottle before having to change resin

[jwplasterers]

Tds 65
I use a bag every 3 weeks and 650ltrs a day 6 days a week

[SeanK]

Iv got a pure freedom ro , got the membranes from daqua, filters from gardiners and 1ltr di from pure freedom,  it's comes out of the RO at 002 then goes through resin , that's what I don't get why it's only lasting a week 

Even when my 40  40 ro is new it still comes out between 25 to 30 b4 resin but I always get three months out of  my 6l bottle before having to change resin

Colin,
Something is very wrong with your system, a 4040 membrane should last 5 years, they fail because the tiny holes in the membrane break down ( get wider) or get blocked.
Possible causes.
Putting too much pressure on the membrane, closing off the waste too much.
RO shock which is caused by applying the pressure to quickly onto a dry membrane.
Chlorine getting to the membrane.
Sediment getting to the membrane.
Some sort of bacteria or growth in the membrane vessel, needs disinfected before the next membrane change.
Not enough water pressure to start with causing the tds to rise quicker than it should as the membrane gets older, which is my
hunch on what your problem is going by the new membrane  TDS readings.
Either way at £250 a year to change I would be looking at getting this sorted.

[Mike55]

I had a similar problem to Colin.

My HF5 membrane was goosed after 12 months and was hoping to get a lot longer than that out of it. 

PSI in 40-50 and twin 10 inch prefilters.  10 min flush prior to each fill (about 1500L per week).

Bought the membrane from Pure Freedom.  What baffles me is I didn't change anything from my previous membrane and  that lasted three years