Hi, I'm preparing to replace most of my ecoearth substrate with large flagstones/river rocks, and also replacing the river stone "ramp" in my WD's pond with stacked flagstones for ease of spot cleaning. I have an array of flagstones selected, and I need to clean/disinfect them before putting them in my WD's water pond. After I get done scrubbing off standing dirt and lichen, should I just let them dry, then bake the rocks for a half hour at ~300f? Or would a bleach solution be a better option? I personally hate bleach and am afraid to use bleached rocks in his pond for fear of poisoning him (the rocks are pretty porous)! Any suggestions are appreciated, thanks!