Garden pond evaporation and how to top up your pond

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In the video I mentioned a couple of different products, heres some links:
*Auto top up valve- amzn.to/3UxpDJZ (Amazon link)
*First flush rain system- amzn.to/3JRDAgL (Amazon link)
*Water conditioner to remove chlorine and chloramine- amzn.to/3QCvMTY (Amazon link)