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because it will form solid when cool
The filter assembly must remain hot when you remove the assembly or the solution contained within the assembly will crystallize to early.
At low temperature it has poor solubility and would crystallize out
"This depends a lot on the filter and also on how often the hot tub is used. Again, while filters vary, most recommendations are to change the filter once every 6 months, more often if the tub is used heavily."
It separates into two
hot water extraction , aqueous extraction, solvent extraction
There is no filter in a hot water tank. It is very easy and cheap to fit one either side of it.
Headache: .5 tsp. of the extract after meals. Cough: .5 tsp. of diluted extract 1 or 2 times a day with a hot drink. Diarrhea: 1 tsp. extract with yogurt twice a day.
hot water extraction , aqueous extraction, solvent extraction
This hepa filter is used to block the mites on the filter. The filter then easily clean with hot soap and water.
one answer is to extract the flavor of a substance by placing it in a hot liquid. For example tea bag put in hot water to make tea. The flavor escapes into the water.
One uses a hot tub filter for the purpose both cleaning any particles in the hot tub out such as grass, leaves, or bugs and to put good water that is chemically balanced back in it.