I have just got a bag of Tulsion resin only had it three weeks used about 5000ltr and while it is still early days so far their is no change in TDSStill a bit early to say that its the best stuff ever so if you like i will let you know how it performs over the next few weeksDean
I used purolite and found it lasted okay but when it went it went quick and the tds rose rapidlyDean