Troy-I used 6 ml in my pond and have zero problems. I also added 1 foot of topsoil to cover it. If livestock or wildlife will be watering in the pond you may have a problem. My two daughters swim on one end, and with the soil and the bouyancy when in the water you can't penetrate the plastic. I believe a 50 ft wide by 100 ft long piece runs arround $100.00. I checked into the 25 ml stuff and you need to own a bank to afford it. I would do as suggested, run a hot wire arround it near the edge and the deer won't jump it. If you have a dam you can do as suggested, if not you can do as i have and run a drain at the low spot for watering.

jd