Question
We did had smaller pond but liner got hole and we decide go to bigger pond than we had currently hole dug to 6x 9ft and 3 deep. Right now trying figure out would be best use liner or have cement pond.  If use concrete do have use certain type and if seal it do also have be careful when put fish in pond

Answer
Dear Bridget,

Thank you for your question.
Personal advise would be to use a liner as concrete tends to contain products that can/would kill the fish.
If concrete is used, in most cases you still need to add a liner or use polyester.
If you live in a warm area (no cold winters) there are some pondsealers usable also.
In most cases however, a liner is the most cheap way.

Hope this helps out a little.
Good luck and happy pondkeeping!

Kind regards,
Raf