I do both. I blow out the lines good wih my air compressor with the anode stick removed to air dry heater. Turn my water heater bypasson. Then add pink by way of water pump. This way I know all the low lines are protected. Don't forget the sink traps shower and toilet!!!!
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2018 Montana 3810MS, 5.5 Gen
2015 Chev K2500HD, 6.6L Diesel
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