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Ditto on the kids pool, I have overflowed many a bucket draining radiators and most of the time you cannot get a 5 gal bucket where you need it. 

The pump to fill the system is money well spent as well. I can recommend a couple of different styles of pump, I have used cheap 12v coolant pumps or pond style pumps as well. The pond style pump I have actually came with a bucket top parts washer that i bought, I used a water based parts washing fluid in it, worked great. 

Here is the 12v coolant pump style:
https://a.co/d/01RB9lIW

Bucket top parts washer:
https://www.eastwood.com/eastwood-bucket...psEALw_wcB

Water based degreaser:
https://a.co/d/01luNhsf