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| − | =Cold Things= | + | =Temperature and Freezing= | 
| − | Writing about cold things
 | + | Freezing temperatures can cause problems with pipes and cisterns exposed above the frost penetration line[http://www.raqsb.mto.gov.on.ca/techpubs/ops.nsf/0/ee1f1756eacc00e18525808200628fbf/$FILE/OPSD3090.101%20Rev%231%20Nov2010.pdf]. | 
|  | + | This maybe a significant issue for rainwater harvesting systems, including residential rain barrels. | 
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|  | =Salty Things= |  | =Salty Things= |