There is no reason for any type of sand additives, cleaners, etc., and sand doesn't need replaced unless you gunk it up with a Baquacil conversion or something. The sand in my filter is on its 12th season. Most people don't think there is much reason to use zeo as it doesn't seem to do any more for you than just using sand.
Might be a good idea to post a current set of water testing results taken with a drops-based kit for us to take a look at to see if we can help you get the pool cleared up. If you don't have a good kit, do yourself a favor and get one! We recommend the Taylor K-2006 or 2006C which you can pick up through the link in my signature below.
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