Sealing a Concrete Koi Pond: Products & Process

For a 10,000-gal concrete pond, you need an impervious, pressure-washable sealant. Options:

Thoroseal isn't ideal for constant immersion. Maintain water chemistry instead:

Use a biofilter with UV. Test kits from your fish vendor.

Pond and Water Gardening: pH Adjustment for Fish Transfer: Raise Old Pond, Not Lower New; New Concrete Pond: Curing, pH, and Fish Safety; Foam and Algae in Concrete Pond: Protein Skimmer Solution?; Reviving an Old Concrete Goldfish Pond; Curing New Concrete Pond: Vinegar Scrub Method; Using Concrete as a Pond Liner: Pros, Cons, and Best Practices; Sealing Cracked Concrete Pond in Australia: EPDM Liner Best; Waterproofing a Concrete Block Pond for a Bronze Fountain; Pond Leak Repair: Fixing Liners, Preformed Pools, and Concrete; Raised Garden Ponds: Benefits, Design Choices & Construction Basics

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