Pool maintenance - Chlorinator and Floatron

[Mjc]

Two separate questions.

We have had a salt water pool for about five years. Unfortunately, the cell has recently gone belly up and the cost of a replacement, with carriage, from Australia is quite high. Does anyone know whether a cell from any other manufacturer might be used instead or are the cells and the chlorinator an inseparable pair?

Does anyone have any experience of, or comments on, the Floatron pool cleaner? We have recently acquired one, which we are using whilst trying to sort out the above problem, but so far, it does not seem to be keeping the pool as clear as claimed.