creating stairs into the water

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If you,are talking about going into the ocean, you have all sorts of environmental hurdles to deal with. In a privately owned pond, it is in your favor. Concrete is a chemical reaction caused by adding water to start the curing process. I believe you could pump it under water into your form as long as the pipe stays within the concrete placed during pumping until form is filled to reduce dilution of mix and it would do its normal "thing", but a concrete or gunite contractor would know for sure. Give Peter Epperson a call.

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