I have got about 300 litres of the stuff in various containers all over the garden
Dave. If my maths is correct that would equate to about £900 spent.
What is the time period and why don't you get an RO system.
Been WFP for about 4-5 years now and only had to buy 4 bags of resin in all that time. Using roughly 1500 to 2000 ltrs of water per week.
Regards
Steve
Oh and just bag it up and put it in the bin. (non hazardous).