[Spruce]

Thanks for clarifying this for me.

I am always worried that I overplay this issue of chlorine removal.

It was only with the last change of filters on my now retired RoMan 450GPD r/o that I saw that the CAG 10" filters were only good for 2500 GALS which I presumed were American Gallons. As I usually changed all prefilters every 3 months and with calculating the amount of water we processed (pure plus waste) I realised that I used far more water than the 2500 GALS between each filter change.

As my membranes still lasted 6 years, my conclusion was that something just didn't add up.

[Alex Gardiner]

Thanks for clarifying this for me.

I am always worried that I overplay this issue of chlorine removal.

It was only with the last change of filters on my now retired RoMan 450GPD r/o that I saw that the CAG 10" filters were only good for 2500 GALS which I presumed were American Gallons. As I usually changed all prefilters every 3 months and with calculating the amount of water we processed (pure plus waste) I realised that I used far more water than the 2500 GALS between each filter change.

As my membranes still lasted 6 years, my conclusion was that something just didn't add up.

With the RO-Man systems you do have two chlorine removing filters one after the other. We have a slightly strange situation with these domestic ROs where it has become standard practice to have three pre-filters (1x sediment and 2x chlorine). Within the general RO industry this is an unusual arrangement as there is not a lot of point having two chlorine filters one after the other as the second one will only really come into action after the first one has stopped removing chlorine. It does double up on chlorine removal though which is probably why you have got away with not changing as often as the capacity states. Also down here where we live there is often less chlorine used in the water than in many cities - Plymouth water on the other hand tastes foul from chlorine.

A more industry standard pre-filter set-up is to have a sediment filter and a chlorine filter - if there is a third pre-filter it would usually be another finer sediment filter to protect the membrane from any carbon fines.

The Fibredyne pre-filter range is a clever way of reducing the need for pre-filters and increasing life through the use of innovative technology. I use them in my house as well for all of our drinking water and I have noticed that they strip the chlorine out far more effectively and at higher flow rates than the previous economy filters I was using.

[Spruce]

Thanks for clarifying this for me.

I am always worried that I overplay this issue of chlorine removal.

It was only with the last change of filters on my now retired RoMan 450GPD r/o that I saw that the CAG 10" filters were only good for 2500 GALS which I presumed were American Gallons. As I usually changed all prefilters every 3 months and with calculating the amount of water we processed (pure plus waste) I realised that I used far more water than the 2500 GALS between each filter change.

As my membranes still lasted 6 years, my conclusion was that something just didn't add up.

With the RO-Man systems you do have two chlorine removing filters one after the other. We have a slightly strange situation with these domestic ROs where it has become standard practice to have three pre-filters (1x sediment and 2x chlorine). Within the general RO industry this is an unusual arrangement as there is not a lot of point having two chlorine filters one after the other as the second one will only really come into action after the first one has stopped removing chlorine. It does double up on chlorine removal though which is probably why you have got away with not changing as often as the capacity states. Also down here where we live there is often less chlorine used in the water than in many cities - Plymouth water on the other hand tastes foul from chlorine.

A more industry standard pre-filter set-up is to have a sediment filter and a chlorine filter - if there is a third pre-filter it would usually be another finer sediment filter to protect the membrane from any carbon fines.

The Fibredyne pre-filter range is a clever way of reducing the need for pre-filters and increasing life through the use of innovative technology. I use them in my house as well for all of our drinking water and I have noticed that they strip the chlorine out far more effectively and at higher flow rates than the previous economy filters I was using.

Our 450GPD r/o was originally a 75GPD and only had 1 carbon filter as the third housing was the resin filter. I never changed that when I upgraded the membranes, just added an extra 2 x 10" housings and filled them with resin as well.

I am also going to put a filter into our drinking water line under the kitchen sink. I was going to use the spare 20" housing, but as our water is so full of dirt, I can't take the sediment filter out. I would expect that a standard 10" housing would work with 1/2" fittings.

[[GQC] Tim]

I just did less then 9000 litres on the CFBC variant and it got blocked up, quite a bit of pressure loss over prefilters. Replaced it with the CFB-Plus and my pressure afer prefilters doubled, and TDS out went from 25 to 13ppm, from 296ppm.

[SunShineCleaning]

If you DI only is there any need for prefilters?