Clean your tub and shower head because there is a lot of unwanted bacteria in the bathroom. Then put your pot of soil on top of a pot caddy in the tub.
If we have a 30 gallon (120 litre) bucket, or if want to measure out 10 x 3 gallon (12 litre) buckets of water then fine. Otherwise we can use the tub and a shower head to work our magic. In this case, we elected to calculate the flow rate of water out of our shower head.
We remove the 10 gallon (40 litre) pots of soil, the pot caddy, and the drip tray from our garden. This gives us an excellent opportunity to clean the floor our grow space. We never want a dirty environment attracting pests and allowing unhealthy bacteria, mould and fungus to grow!