The STEAM by Design class in the Middle School saw a problem with the amount of Germ Attack Hand Sanitizer dispensed when users pressed the pump too far down. After researching how much sanitizer should is needed to ensure adequate disinfection, we determined the average amount should be 2.4 mL – 3.0 mL. Two sites we used are https://www.cdc.gov/handwashing/show-me-the-science-hand-sanitizer.html and https://pubmed.ncbi.nlm.nih.gov/18538702/.

We tested different sized Sani Savrs and settled on sizes in the 55 – 60 mm as these models will dispense approximately 2.4 to 3.4 mL. Considering that not all hands are the same size, we recommend using a 55mm for larger hands and a 60mm for smaller hands.

Dispensed Amount Calculations and Possible Savings

	Amount Dispensed mL*	# of Squirts per Bottle*	Increase in # of Squirts*	Savings Per Jug*
No Sani Savr	23.3mL	162	0	$0.00
55mm	3.4 mL	1112	950	$9.50
60mm	2.4 mL	1800	1638	$16.38

STEAM by Design Sani Savr Ad