Question
I have a 10 yr old koi pond that is 15x17ft square. I am now wanting to enlarge it and build a shelf on two sides. What is the best ans cheapest way to join two pieces of liner to make them water proof? Can you use silicone seal (aquarium sealant)? can you give info on who to order products from?   

                 thank you
                        Cheryl

Answer
Hi there!

Try Aquascape Designs, they have everything you'll need for enlarging your pond.
You should buy a seam tape, a cover tape, primer and glue.
It is very easy to do it.

Do Not Use Aquarium Sealant!

Good luck with your project!

Carlo