I have 20X40X (8.5 deep) gunite pool, 34000 gallon, and 8X8 1200 gallon gunite spa, separate units, no waterfall, with underground equalizer pipe that is closed all times, on one Hayward DE 72 filter and one 400,000 gas heater system with JVA's controllers, and RS8 automation governed by a wireless Jandy Touchlink system. There is a Zodiac Nature2 combination salt water generator and mineral feeder that only chlorinates and treats when the pump is running. Both pool and spa have motorized Zodiac automatic covers so evaporation and rain dilution is zero all the time. I use 2 floating chlorinators since chlorine tabs where I live are very cheap at 90 cents a pound and only run the pump 2 hours a day. I have to chlorinate the water in the winter since winters are warm, with the floaters to prevent algae, under the winter cover, since the plumbing is winterized. I constantly have very high cyanuric acid levels all the time, summer and winter, and have to dump water from the pool very often and empty the spa completely and frequently to get rid of cyanuric acid (levels are running 150 to 200). Also can't use cal hypo with the high calcium hardness gunite pool water requires. Pump run times are short because the water is always very clean. A bleach feeding system still requires pump run time to work. Dropping bleach bottles requires being at home every day and raises salt levels even higher in SWG setup pool, so not an option. Only options remaining is liquefied bottled chlorine gas (CL2) feed via a deep end bubbling system (no circulation pump run time needed) or a commercial European ozoninator for a 35,00 gallon capacity pool. The cost of bottled CL2 gas is $350 for a fill of a K or H tall steel cylinder with $175 deposit for the tank and needs upright chained transportation or get a residential delivery for an extra fee. Cannot find much information on this website how to build and set up a CL2 deep end gas bubbling system. Ozone production is constant every 20 minutes and not sure how this works in the winter time. Large volume ozone machines seem very costly, and likely need to be imported from countries where they are popular. Is the only cost effective solution to keep constantly dumping water?