Does underlayment travel underneath the cataract liner? This is for a garden fish pond.

This is for a garden fish pond.

---

Answers:    It is a good opinion, it will help the go of the liner. If it's a waterfall Im asuming you are going to stack rocks lying on the liner and underlayment will give it a bit of cut resistance.

---

Yeah you can. It will relieve in the long run.

Also it depends on the standard of the liner you are using.

---