Looks like I need to replace my salt cell. I am getting "check salt" and "inspect cell" indicators, as well as inconsistent salt level readings. I just checked online and it looks like the replacements (40k gallon) are $900! I was not expecting this. A few years ago I bought my last replacement for around $400. Is this normal, or supply chain issues, etc? Is it worth looking into off-brands or is refurb options? Any advice would be very helpful. Thanks!