Plan what the shower is going to look like and how many shower heads it will have.

Time for some math!

It's very easy to calculate the Gallons per Minute (GPM) that is able to be supplied by your shower. I wanted to know very accurately how much my shower could deliver. Using a bucket and scale, I measured the weight of the water over 30 seconds.

Weight of empty bucket - 2.3 lbs

Weight of bucket after collecting water for 30 seconds - 21.0 lbs

Weight of water inside bucket - 21.0 (lbs) - 2.3 (lbs) = 18.7 lbs

The weight of a gallon of fresh water is about 8.344 lbs per gallon

18.7 (lbs) / 8.344 (lbs per gallon) = 2.24 gallons inside the bucket after 30 seconds

2.24 (gallons per 30 seconds) x 2 ≈ 4.5 GPM

Knowing that my shower could supply 4.5 GPM, I went to select my shower heads. Wanting to have 6 shower heads, I knew that for each head to be operating at its full capacity, my shower heads needed to be rated at .75 GPM. Not finding any shower heads that I liked with that rating, I went with 6 heads with a rating of 1.5 GPM with the possibility of needing to reduce the number of heads later on.

A blessing and a curse for me is that I'm tall. And as many tall people are aware, most showers are not really tall person friendly. A must for me is that it needed to be tall. After measuring the width of the shower at just under 29 inches, I knew what parameters I had to work with.