[julianbiggs]

We've had our 4040 ro since August 2012.

We're a 2 man set up using 500-600 litres per day.

So we've been using it for 18 months totalling  around 306 days ( full days )

My water measures 185 from the tap so not too hard really

I checked the tds yesterday and its reading 29. rechecked it several times and still around the 29 mark.

After 18 months should we need to replace the membrane ?

[gto]

29 is high for RO output.
the lower the better, it should be under 10 really. before DI

[Smudger]

How often have you changed the prefilters ?

Have you left it to stand over Christmas for a couple of weeks where it may have dried out ?

Darran

[Spruce]

How often have you changed the prefilters ?

Have you left it to stand over Christmas for a couple of weeks where it may have dried out ?

Darran

Ours has been in for 18 months and still producing pure at 2 ppm with 115 ppm input. As per Darran, regular prefilters are very important to long membrane life especailly with the cost of them.

[Steve foster]

Mine lasted 12 years. Changed it when it reached about 015 TDS.

[a900]

12 years. No way.

What were you doing to keep it going that long??

[Steve foster]

Straight up, Harrogate tap water is very soft. Regular 3 monthly filter changes. Never use resin. Buetifull 

[SeanK]

Mines going on 6 years and is still getting the tds down from 210 to 12ppm.