Gareth, good for you. I'm surprised about the clay, but that's a great thing. If you can hold water, you can fix water, so any turbidity issues are far easier to fix than a leaky pond.

I like to take before/during/after pics so I can have a visual history of progress. You're entering the world of record keeping, and it's fun to look back on successes.

Again, welcome aboard and good luck.

AL