Hi, I was planning on putting down a geotextile liner to separate the clay the pond was dug in with the 10mm round river rock I'll be putting on it. Does anyone have any tips for me. I'll also be putting up some cinder blocks on the ledge before it drops into the deep end to catch and rocks from taking the plunge into the deep end.

I was also wondering about using or not using the geotextile in the area of my pond where we'll be planting filtering plants. My thoughts are that it won't allow too much to grow up from the clay underneath and won't grow too many unwanted plants. Or should I not worry about it and just plant in that area without the geotextile?
Thanks