I think that you are just a bit too big for the Liquidator to work, even if you did the upgrade. Punch some numbers for your pool in the Pool Calculator and see what kind of values you get. Then do the math on a 2 ppm drop in chlorine daily, and you should get pretty close to what you would need for make up bleach. I really think you are more of a candidate for a peristaltic pump at your volume.
I'd recommend the Stenner over anything else then any perstaltic over diaphragm any day. You can get a Stenner pump with a 30gallon tank. That'd last you about 20 days between refills.
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