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boiler additives?

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neilc3
neilc3 Member Posts: 1
2 different systems,same type of problem
1: steam two pipe, 1-3# some traps stick closed at first run in fall
2: hot water fin tube rad. w/ zone valves, same situation, after closed for summer some will stick closed for first call for heat. these fail open, spring opens vlv motor closes vlv once satified

on city water, looks very good on test reports
any additive that mite help?
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