Hi, and welcome to the forum!!
Yellow out will create a huge chlorine demand in your pool, so I wouldn't add it unless it was absolutely necessary. What did you use to chlorinate with last year, and what was your CYA level on closing? What is your CYA level now?
I'm not sure what you mean by "pollywogs", but you need to scoop out as much of the debris as you can with a net or leaf rake--no sense in wasting chlorine sanitizing leaves!. Then we recommend using plain, unscented bleach as a chlorine source to clear up the mess. We can calculate doses for you and give you better advice if we have more specific information about your pool, so please take a few minutes and fill out this chart for us with your pool's info..
Pool Chart Entry Form
Pool Chart Results
Also, you're going to need a good test kit to know how high your chlorine is, since you need to reach a shock level that is determined by your CYA and maintain that level until your pool clears up. So...we need a set of test results, taken with a drop-based kit (no strips!) to know where to go from here. If you don't have a good kit, take a look at the K-2006 linked in my sig--we highly recommend that one. While you're waiting for it to come in, check your local WalMart and see if they have the hth 6-way kit for around $20. That will at least allow you to run a basic set of tests to get you started.
Just out of curiosity, why are you switching to zeosand? I've used both in my pool, and I can tell you that I don't really notice any difference between the two, except that zeo is more expensive. If you haven't bought the new stuff, why not just leave the old sand in? It doesn't have to be replaced unless it's gummed up by some product, or Bacquacil conversion, etc. My3 co-mods are all over 10 years each on the sand in their filters--and I would be, too, if I hadn't switched to zeo during a filter problem a few years ago. Quite frankly, though, if I ever have to take the zeo out of the filter again, I'll be switching back to sand. No need for the extra expense. However, if you decide to change the sand anyway, I would at least see if you can use the sand that's already in the filter for cleanup.
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