There are some pool services who use larger swings of chlorine at high CYA levels. One pool service in hot states of Arizona, Texas, Nevada and southern California uses 100 ppm CYA in their pools and raises the FC to 14 ppm during weekly dosing with the FC dropping to around 4 ppm by the time they re-dose the next week. One can use 50 ppm Borates in the pools to reduce the pH swings and as a mild algaecide, though that is optional.
As for automatic dosing, there is
The Liquidator, but see threads on this forum (
here and
here, for example) about that since there are potential downsides (calcium carbonate "white stuff"). Another option is a peristaltic pump, but obviously these options cost extra.
A hybrid approach using some Trichlor, some chlorinating liquid or bleach, and some dilution of the water to help keep the CYA in check can work. This is easier if there are rains that can overflow the water to dilute it.
Richard