Wiring the SWG controls to the same (timer-controlled) AC line as the pump doesn't sound like a good idea to me: pumps are 'noisy', I suspect they have large surge currents like an air conditioner (not really sure though), and would likely produce voltage spikes when turned off.
All of these are bad for integrated circuits and transistors; any voltage spikes on the ground line during turn-off can easily blow most ICs
I know that Hayward also recommends wiring to the pumps AC supply, not really sure why since I think they still have a flow sensor anyway.
Comments on pump spikes/noise/etc welcome, as I am not really sure how bad the problem is.

I know that a light bulb on the washing machine circuit really flucuates with the wash cycle
Maybe I'll hook up a light bulb to my pump power and try a few on-off cycles .
My old SWG is a Pure&Clear model, with the cell actually in the pool; it was installed using a GFI receptacle. I guess cells that mount in line don't need GFI protection
Mike K
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