Empty your mix tank,
make up a solution of 50/50 descaler/water & pour in mix tank,
connect a short hose from solution outlet to mix tank,
start up machine with pump on so it's circulating back to mix tank,
when it's hot switch TM off and remove orifice,
restart it after about 30 minutes to re - circulate and leave for another 30 mins,
finally run it around once more then drain mix tank,
refit oricice making sure the screen is clean,
refill with fresh water and pump it around, do this a couple of times to make sure all de-scalers is out.
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