DIY Foaming Hand Soap 18971
The process is incredibly simple - the foaming pump works because it injects a bunch of air into a small amount of soap as it pumps. Most hand soap is too viscous to accept this air, and it just causes problems. Solution? Make a solution! Water down the soap.
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http://www.instructables.com/id/How-to-Refill-a-foaming-hand-soap-container/
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