Very good! Reserve water was became one of my primary "stress-relievers"! Any time I got into a question of fish not acting just right, I loved have a barrel of water to allow me to do a major water change, just "because". But then, with the water barrel, I found there was a problem with my mind becoming distracted. That left me also buying a bunch of the cheap water alarms off the auction site. At $7 each , I found they were great to stick on any tank or barrel that I might run over in the floor! Whether refilling the reserve or just filling a tank, I found dozens of ways to flood the place. Fortunately my fish room is a slab floor with laminate on top so no major harm was done except to my attitude.