Response to Hi Sue, Yes this cell can be used with 1.5" pipe and the system includes these adapters, also the cell can be mounted vertically. Yes, this system will work on an 18,000-gallon pool. If your pocketbook can afford it then we always suggest oversizing to the 40,000 gallon Crystal Pure Salt System as you will get longer life out of your salt cell and the larger cell will really allow you to crank up the chlorine production if you ever get into a demanding situation like an algae bloom. With this being said the 20,000-gallon system still would be sufficient.

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