Difference between Polaris backup valves?

The G59 is described as a “double acting” backup valve. It runs twice as fast and backs up the cleaner more frequently.

The G52 is said to backup every 2 1/2 minutes. The G59 backups approximately every 1 minute 45 seconds.

I think the G59 is used in smaller pools where the cleaner gets stuck in a corner more frequently.
 
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