I put a bucket under the low point drains and first tried to see what was in the fresh tank. In my case (and I hope yours too) nothing came out. Then I opened the hot and cold low point drains, which drained a lot of the antifreeze out. I then hooked up my city water and made sure the tank fill was
not on and the water heater was still bypassed. I left the low point drains open and turned the city water on and it flushed the anti-freeze out of the lines that were in the house. I shut the water off and closed the low point drains.
Then I pulled the plug on the water heater and on mine, they had filled it with antifreeze too.
So I drained and flushed that out. Re-installed the plug.
Now you can turn back on the city water, close the tank fill and let it fill a little and shut off the water and open the fill valve. Now I opened the faucet in the wet bay and turned on the pump - this flushes the contents of the pump out - nothing should flow through the house since the lines were full and there was no call for water. When clear shut off the pump. Now go into the house (RV) and open the cold water faucets everywhere - turn on the pump again and clear all those lines - don't forget the toilet.
That's what I did - hope it helps.
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