Repairs and repointing to a pond

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What ratio of prompt and sand would be best for mortar joints under water?

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Hi Gary 

Prompt when mixed at 1:1 by volume will be waterproof, however for a more durable mortar you could go with 2 parts Prompt to 1 part sand. 

The pond would need to be filled and drained at least once before use. 

If you would like to discuss the application in more detail, please contact us on 01208 79779.

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