With no other information, all I can tell you is use bleach and lots of it. Cal-hypo may be OK but it depends. I don't know what else may be in septic tabs.
To give you useful advice we'll need more information. Please Post your pool info here:Pool Chart Entry Formand get a good test kit ASAP:
Pool Chart ResultsHTH 6-Way Test Kit @ WalmartThe wall mart HTH 6-way drops kit is a decent starter kit but you'll really need to order one of the K-2006 kits to operate you pool.
Taylor K2006A (3/4 oz bottles) @ Amazon
Taylor K2006C (2 oz bottles) @ Amazon
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