i have never blown out the lines so i cant comment on weather its good or bad .
i always bypass the hwt and drain it by removing the outside drain plug . drain the water tank . hook the waterpump suction to a gallon jug of anti freeze and run each tap , one at a time till the antifreeze comes out for a few seconds . flush the toilet till antifreeze comes out .usually i run out and have to hook up a second jug . once i have anti freeze to all the taps , i run the rest of the antifreeze a bit at a time through each tap to fill all of the drain ptraps with anti freeze.
done . two gallons of rv antifreeze , the pump and everything downstream is protected . the p traps on all the fixtures are protected . have been doing this for over 25 years on 4 different rvs and never had a problem .
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