I've used HTH algaecide - do I need to drain my pool?

[Whattf]

Please measure the pool's dimensions. It's hard to dose correctly, with incorrect volume calculations -- but about 30% of pool owners use seriously incorrect values.

So, you're right. I re-did some rough calculations today. My pool is two heptagons (7 sided) joined by a rectangle (it's a custom made pool). It's apparently roughly 2100 square feet so it's roughly 15.5k gallons. Still waiting on my kit.