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Thank you sam for the reply, can you let us know when your first resin change is, just to see how long it lasts with a high tds, thanks.
Just use a resin calculator. The WCW one will give you an idea. Its not 100% guaranteed.
http://www.windowcleaningwarehouse.co.uk/resin-calculator.html
http://www.gardinerpolesystems.co.uk/Resin_Calculator.htm
My resin usage is between these two calculators.
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