SWG Buzzing after pump turns off

That means your SWG is relying on the flow switch to shut down chlorine GAS production when the pump shuts down. If the flow switch fails, that gas production will continue which leads to a buildup of gas in the plumbing system and a risk of explosion.

The SWG should be wired to a timer so that it is only on within the pump's start and stop times. Do you have a timer? Do you have automation?
 
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That means your SWG is relying on the flow switch to shut down chlorine GAS production when the pump shuts down. If the flow switch fails, that gas production will continue which leads to a buildup of gas in the plumbing system and a risk of explosion.

The SWG should be wired to a timer so that it is only on within the pump's start and stop times. Do you have a timer? Do you have automation?
Nope no timer other than what's on my pump. Automation is manual and requires us to flip a switch.
 
You have a variable speed pump which should be connected to power at all times. Scheduling should be done at the variable speed pump panel.

What does the switch do when you flip it? You keep it on at all times? Does it control the pump or just the SWG? You may need to figure out how to connect the SWG to a timer.
 
As an alternative to a SWG timer, many pool owners with variable speed pumps run their pumps 24/7. Variable speed pumps running at low RPMs use much less energy than a a single speed pump. Running 24/7 greatly reduces the chance that your pump will shut down when your SWG is powered up.