I just filled mine last week and got sick of the foam and chasing chemistry in that stupid Frog system. So, I drained and started over. I used a sump pump to get the water out faster. That took about 20 minutes total, plus a few minutes with a shop vac getting the residual low spots.Thanks for this. I wish I would’ve read this before I drained the water but I’m buying one for the next drain.
My plumber did give me some good advice about refilling. He told me to piece together a few water hoses and run one from the back of my washing machine, where the hot water hook up is. I have 2 50 gallon hot water heaters, so I just used that 100 gallons of hot water, combined with the ground water in the outside hose bib and the water was 90º when completely filled. Also, with 2 hoses going, it took 45 minutes to fill a 450 gallon hot tub. So, I was up and running the same night.