Contrary to popular belief, you don't ever need to change your sand unless you've gooped it up with some sort of odd chemical, or Baq conversion, or some such as that. My other 3 co-mods, as well as a lot of the other long-time members on this forum, have sand filters with sand MUCH older than yours. In fact, my co-mods each have over 10 years on their current sand! (I would, too, if I hadn't decided to experiment with zeo, but even then my sand was 5-6 years old and I was fine with its performance). If you're having recurrent algae problems, it's because you're not keeping an adequate level of chlorine in the pool. If you post a set of test results for us on your pool water, using drop-based tests, (no strips!!), we'll be happy to help you get that cleared up.
Also, we need to know what the ingredient is that's in your "shock" (dichlor, cal-hypo, etc). You don't really need algaecide--an adequate level of chlorine is the most effective and cheapest algaecide you can use. What's the ingredient in the one you've been using?
Welcome to the forum!!
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