As I am sure many of you have already realised I am in the process of renovating and upgrading an existing pond. I am not do sure if the existing and new pipe couplings are going to take the pressure of the water flow once the pump is installed so I am thinking of using collar clamps wherever a coipling and pipe meet. However, some of these joins are underwater. Is there a rust resitant collar clamp available ? Plastic clamps just dont seem strong enough so I guess metal clamps are the only option. Would coating these clamps in Silicon/Waterproof paint be an option (in order to avoid rusting)?.

Stainless steel clamps available from most hardware stores and Builders Wharehouse. They are about R 30.00 as apposed to R 3.00.

What type of pipes wre used in your pond and what type fittings - is it glued on fittings and PVC pipe, are the pipes and fittings white or blue and grey. I can not see that the pipe clamps will work on your PVC pipes and fittings.

I am prob. gonna use class 3 polyprop piping...its makes it easier to follow the curves of the pond