[combat1]

Do many of you have a carbon block filter as part of your system?
I have just fitted one and wondered what benefits it may offer to the system, still have the basic carbon filter as well.
Also fitted a water softening vessel which uses a softening resin to soften the water before it goes through the filters, haven't a clue as to how long the resin should last, anybody else got one of these?

[Spruce]

GAC is also a carbon filter and it stops chlorine from getting to the membranes. But a GAC filter is only good for 2500 US gallons  which is 9500 liters. As US gallons are smaller than Imperial gallons, that isn't much water, especially as you have to count the waste as well.

However, various companies supply different service life figures. The one I looked at says it has a service life of 5000 gallons, twice the figure on the label of the one Gardiner sells.

As these are used for all sorts of different applications, such as water coolers, it is little wonder then that they also specify that they should be replaced at least every 9 months.

Better to use a single Fiberdyne carbon filter from Gardiners as they will process about 38,000 liters before needing replacement. The filter can be used on its own as a sediment and carbon filter, but we also use a sediment filter first as our water is laden with sediment.

[SeanK]

Its very easy to get paranoid about pre filters and forget their actual purpose which is to protect the
R.O. membrane.
For example my membrane is over 5 years old so would it be wise for me to spend a hundred quid or more
a year to protect it when its close to the end of it lifespan anyway.
I have actually talked to guys in the past who where spending more yearly on pre filters than it would have cost to
replace the membrane yearly.
If your not going through membranes very quickly then leave things as they are and don't worry so much about an
item that only costs about £240 to replace.
I mean even if you take a couldn't care less approach to changing pre filters and only get 3 years from your membrane then that's only £80 a year.
Three Fiberdyne filters would cost you £100 a year.
Put it this way my tap water TDS is about 250ppm and I haven't changed the pre filters in over a year, and they are the
budget ones.

[mark15]

My systems got a softening vessel (advised to re juvenate it every 6 weeks)... also got carbon & sediment pre filters 20" & was also advised to change every 6 weeks.I did buy a chloroplus sediment filter which was about £40 but lasts a year...