I'm not sure what the 'six bits of advice' might have been. Perhaps you are thinking of our Super Simple Startup Recipe that you can find here:> http://pool9.net/ssr/

Regarding foam under the liner ------ I have it under my pool but PoolDoc's opinion is that it is usually not a good idea because he feels it makes it easier for a sharp object to pierce the liner. But, I will tell you that even with it, there are still indentations under the liner. There is no such thing as a perfect pool floor when you have a liner pool ---- at least none that I've ever seen, anyways.

Welcome to the Pool Forum!