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My one suggestion, if you're making 10-30 gallons or more, is to get a 
plastic trash can that twists and locks onto a round dolly.  They are 
expensive, but they would make moving tubs of water (or bubbles or .... 
)  soooo much easier for your staff, especially compared to 5-gallon 
buckets.  You can add a small sump pump even.

We've been using them here for filtered water for our coral-reef tanks 
(the white trash cans, which are food grade).  

We get them at a local restaurant supply place.  Looking online I see 
that Home Depot and lots of other places sell them too-- "Rubbermaid 
Brute Trash Can Dolly."  The trash cans come in several sizes from 20 to 
55 gallons;  lids are usually sold separately.  I found the following 
one (of many websites) that has photos:

http://www.janisan.com/Rubbermaid/RoundBrutes.html

Kathy Krafft
Exhibit Projects Director
Sciencenter
Ithaca, NY

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