Beautiful pool to pond conversion! Do you have water being pumped up through gravel in your bog? That can help a lot to keep the water clear, as lots of gravel means lots of nitrifying bacteria.
I did try to place a gravel barrier on the old waterfall from hot tub to main pool. The roots of the parrots feather and others have gone so deep into that but it’s really not working well. Any other ideas? I like how the parents feather flows over the waterfall.
One idea would be to rig your pump to flow up through the gravel by hooking it to a PVC pipe with holes drilled in it (or slots). That way the water gets distributed through the gravel and slowly bubbles up to the surface, providing oxygen to beneficial bacteria along the way. The bacteria convert the ammonia from fish waste into nitrites, and the plant roots growing into the gravel from above continue the process, turning nitrites into nitrates. The end result is very clean water without much in the way of nutrients left over to support algae in the pond.
