mjwalsh
6 bay SS w/laundromat
carwashireland,I have a site with a tds of 220 and the membranes last about 6 months and another site with a tds of 100 which lasts about 12 months. The flow rate is a bit slow which is why you need good storage. The membranes also last longer if the feed goes through a softener. I tend to change the membranes when I get a tds of 50.
So the following has proved to be both reliable & durable? http://www.amazon.com/HM-Digital-DM-1-In-Line-Accuracy/dp/B001EHAZGW/ref=pd_bxgy_60_img_z It sure seems like a better alternative than the other TDS testers for both water in & water out.
BTW on a side note ... I do have Irish ancestry from my daddy's side & am proud of it!
mike walsh http://kingkoin.com/USA_Deficit_Reduction.html