If i use planting containers for my aquatic marginal/bog plants, should i make it so that there are no holes - will holes prevent some anaerobic activity in a pot/container with soil. I do not want to use nutrient sterile clay - prefer to try dirt with a thick layer of pebbles over it.

WHAT ABOUT WEED BARIOR sheets - when you put that on the ground, it allows water to pass through - would this allow oxygenated water to pass? what can i do?

I like to use the pots without holes because even with burlap (an extra pain), the pots with holes can leak dirt into the pond. They do allow more water circulation in the pot though which might reduce the anaerobic activity in the pots. My pots and pond are fine using Lerio pots (no holes).

I've never tried weed barrier fabric to line holed pots. It might work IF they haven't impregnated it with any chemicals. Burlap is the industry standard for lining holed pond pots.

Will burlap rot in a years time or maybe roots will pierce it, opening wider holes thereby allowing soil to escape after this occurs.

I've never used burlap myself. It's what I always see been offered or told to use for those commonly sold pond plant containers full of holes. I'm sure, over time holes would develop, and it would eventually degrade but probably not before a repotting was due for the plant anyway.

what about frank's weed barior - i emailed frank's and they said that its non-toxic poly something i think....

I've never tried weed barrier in my pond. If they claim it's non-toxic and won't degrade when wet, then you could probably use it.