I'm trying to make my water a bit more RO friendly. I got a water softener the same as yours off Alan at purewater products this week, I've set it all up and got it running into a triple prefilter then 4 x 100gpd membranes in series, it was 3 but I've just added another to try to get a better % of good to waste water as I'm on a water meter. I'm currently getting 60/40 but would like to get it to 70/30, I've been running RO now for about 8 weeks 24/7:
Can I suggest if you are going to push the product/waste ratio any higher you add an additional membrane particularly given your input tds is fairly high (im assuming)
Note following RO primciples 4 membranes can be pushed to 60% and 5 to 67%.
I have been running 5 at around 65-75% efficient for nearly a year now with no problems thus far.
I will add another membrane at the begining of next season, I was a little late this year going down the RO route and I'm only using RO to top up after filter cleaning over winter.
Wow, some of the figures quoted make me happy about my water, my tds is 180 from the tap, gh is around the 100-120 mark and kh around the 60-80 mark, depending on when I check it, so RO looks a very doable option on my budget, and not on a water meter (yet). Night be able to get the membranes of a mate who dialyzes at home, if they have a stricter tolerance before they replace I might be able to use the old membranes.