Can't believe this, I've emailed June at Gapswater immediately, here's the email (saves me typing twice)
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Hi June,
I bought 18 August an HF-4 membrane, and fitted it in September.
I've set it up so it produces 64-35 Waste to pure ratio. My TDS in is 330ppm. 45PSI after prefilters.
Now, I never could get it under 13ppm from the beginning, I kept an eye on it for about a month, and it would never go down further then that. After every daily 250-300l fill I always flushed it for 20min. Fresh prefilters as well.
I haven't checked the TDS for about a month, I just checked the tds after the membrane, and it's a shocking 67ppm!!
I've checked with a number of people, and apparently there have been a few duff HF-4's on the market. I'm just wondering if I have got one. My resin is completely spent now too, so it has been happening for a little while.
Please help June!
Thank you in advance,