I take a different twist on the dealers' "discouragement"--but it's compatible with Kelemvor's comments.

I suspect they are going to push you toward alternatives to straight chlorine sanitation. These could be: Baquacil, Bromine, an ozonator, or Nature2. NONE of them work as well as straight chlorine, all of them are expensive to use and maintain and their only "advantage" is transferring your money to the pool store or pool service.

Converting from Bac or Bromine to chlorine (when they fail and your pouring hundreds of dollars of chems down the drain) is difficult and fairly expensive. Ozonators, in the US, because of safety limitations (Ben's far more knowledgeable) don't work.

Nature2 uses lots of vague words but they never really tell you how it works--they just tell you it saves you money on chlorine. What it does is erodes dropping silver and copper into your water (copper is what turns blonde hair green). This can control and even prevent algae, but doesn't sanitize your pool. You just, in theory, use less chlorine because you don't have to use it to kill algae, just the pathogens you don't want in the water. BUT....the cost of installation and the annual cost of the Nature2 cartridges buys A LOT of bleach/liquid chlorine!

What you can do is make sure your installer's plans have plenty of room to install extra plumbing for a future SWCG, and that the wiring for the pump can be easily adapted to add on the SWCG power supply.

Meanwhile, learn our BBB method of pool maintenance, and get a good test kit--We recommend the Taylor Technologies K-2006 or K-2006C. Once you learn how to test and adjust your pool's water, you may find you don't need an SWCG.

I thought about getting one for YEARS but could never justify the cost. It was only when we started travelling more, and would be away for extended times, that I got one to make maintenance easier.