1. Get a Taylor K-2006 (testkit info page linked in my sig) or an HTH 6-way kit, made by Taylor and sold by some Walmarts. If you can't get the HTH kit, get a cheap OTO kit for now.
2. Buy a bag of filter sand, and then compare the sand you have with the sand from the bag. If the particles are the same size AND the sand you have is clean, you can use it.
3. Post your pump / filter make/model if you want help on the pump noise.
Best wishes!
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