I am about to cast a hollow concrete plinth on which a fountain will sit.
The outer mould will be a galvanised steel ring 10 inches high by 24 inches
diameter the inner mould being a plastic bucket, the space within the
plinth will house a pump to drive the fountain.
.. I don't intend to keep fish or plants in the pool so I'm not bothered
about the toxicity of the water.
The plinth will, when cured, be totally immersed in water, and I wondered if
there was a special mix or additive I should use to protect it from long
term immersion.
What does the team think?
Regards
Don