 Pond Decision
If your in California gunite may be the best as described before in the ability to "float".
Solid pour wall that are reinforced are also good, but setting forms to hold back xxxx tons of cement is not for the amature to attempt.
Liners, however, present many potential issues, aside from puncture, and seals around drains and TPS's. If you use Potasium Permaganate it will deteriorate the liner.
In addition, the folds will be a perfect place for the nasty bacteria to flourish!
Go Gunite! Personally I'd avoid CIM, because I've used it, and it very difficult to work with. You have a half-hour "pot-life" after mixing, and youd better mix it well.
Ed
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