water hardness question

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40ozOLDe

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Joined
Apr 1, 2007
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Location
MASS
so i was brewing a red ale today which consists of these ingredients (straight from my recipe):

4lb. can mountmellick AMBER liquid
2lb english light Died Malt Extract
8oz medium crystal
20z black
1oz Northdown (bittering hops)
1oz Cascade (aroma hops)

i steeped my grain for 10 minutes. My directions then call for adding Gypsum (if water is soft)

what is this? how would i check? etc. Any insight i appreciated. Thanks:tank:
 
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