I'm down to a third of a bag of resin and the TDS is starting to rise. Time to buy more resin me thinks. Oh dear stocks are low! Daqua: out of stock until mid July Purefreedom: out of stock until mid July Grippatank: out of stock until mid July Corwoods: have added postage, so no longer the cheapest option Is there a boat load mid Atlantic on its way from India? Seems lots of companies are waiting for a shipment. If that boat sinks, then we're all doomed, doomed I tell ya! Eventually ordered mine from here http://www.osmotics.co.uk/products/25-Litre-Tulsion-MB%2d115-DI-Resin.html Take my advice and buy some now as it looks like the UK is getting low on the stuff. You don't want to get caught high and dry folks.