my fish pond has a leak in the bottom. The pond is some sort of rigid black plastic or polypropylene. How can I fix the leak? The hole is about 8cm by 6cm and has dirt underneath.
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That sounds like a big hole @andreajoe!
You probably want something like this - https://www.bunnings.com.au/crommelin-1l-black-pond-sealer_p0960194 - and this https://www.bunnings.com.au/crommelin-100mm-x-10m-reinforcing-fabric_p1070654
Can you dig the pond out?
An alternative might be to forget about the hole and just use a new liner - https://www.bunnings.com.au/our-range/garden/garden-decor/garden-water-features/flexible-pond-liners
Welcome to Workshop @andreajoe. It's lovely to have you join us. I trust you will receive lots of helpful advice and inspiration for your projects from our community members.
You might like to share a photo of your pond - it would help our community members see what you were dealing with and provide more specific advice. Hopefully @Kermit's suggestions also help get you started on a solution.
Please let me know if you ever need a hand getting the most from the site.
All the best,
The hole is blocked by rocks and a piece of cement installed by previous owner.
When it is not so tropical we will pull the existing pond out and install a new lining.
I will report back when it is done.
Thanks again Kermit
Sorry that shousld be " or install a new lining"
No probs @andreajoe.
Another option is just replace the pond - https://www.bunnings.com.au/search/products?q=pond&facets=BrandName%3DAquapro
BTW, this suggests putting sand in the hole before the pond carcass to ensure rocks don't perforate it - https://www.bunnings.com.au/diy-advice/outdoor/paths-and-landscaping/how-to-build-a-garden-pond