Trying to figure out what is in this picture. According to the manual which the previous owner left behind, it is a “Nature2 Pro G Plus Inground Sanitizer” made by Zodiac Pool Care. However, I don’t know what it does. The vessel on the right I unscrewed and it is clearly a trichlor erosion feeder because it had the pucks in it. The mystery is the vessel on the left which appears to be some sort of replaceable cartridge. My CYA is way above acceptable levels, and I think it got that way by using these trichlor tablets, so I don’t plan on using this anymore in favor of the BBB method.
1. Why does this thing have a cartridge when I already have a sand filter? I had thought that a system could use one of three different types of filtration (sand, DE, or cartridge) but not two of the three at the same time.
2. If I intend to use the BBB method, can I leave this apparatus in place without replacing the cartridge every 6 months?