Hey guys my first post, I plan to do the entry to my swim pond as a pebble beach set in a layer of mortar, can anyone advise on a brand or mix that will work best for my underwater application? Trying to avoid having parts of the mortar pebble entry breaking off after hard use.

I would contact some pool companies who have experience in your geographical area and ask them what they use. They might be the best information resource for you.

Sorry to hijack... Am i crazy for wanting to put a waterfall disguised as a mini creek flowing into my 1/2 acre pond? I want to incread dissolved oxygen levels and maintain cool water temperatures. I want to stock trout for all season enjoyment. Any insight appreciated! Thank you!

Sika, BASF, Euclid, call their tech service numbers with your specs, they will get you in the right product.