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Normal
Yes just turn on the tap and 'Let it bleed' Do it at the start and pour it back in and prior to taking pre boil gravity run about 2 or 3 litres through it, and tip back in otherwise you will be measuring the gravity of the contents of the helix. You will see the difference in the colour of the first drop which comes out, it will be very pale because it hasn't been involved with any recirculating.