So you're getting into koi keeping

Handles ponds up to 3,500 gallons with mechanical and biological filtration plus a built-in UV clarifier. Everything you need in one unit — no separate UV purchase required. Aquascape is the brand serious pond keepers trust, and this model has earned it.

TetraPond's pressure filter handles ponds up to 1,250 gallons with UV clarification included. Backwash cleans without disassembly — a real convenience win. The right entry-level filter for a modest first pond of 500–800 gallons.

OASE is the European koi-filter benchmark, and the BioSmart 10000 handles ponds to 10,000 gallons via gravity-fed flow-through filtration. Foam chambers provide true multi-stage biological filtration. The built-in cleaning indicator tells you exactly when to backwash. Worth every penny once your pond grows past 3,000 gallons.

The Aquascape EPDM liner is fish-safe, UV-stabilized, and durable enough to outlast your filtration system. Available in multiple sizes with underlayment — one order covers what you need. The material stretches around rocks and irregular shapes without tearing.

Firestone's PondGard is the original EPDM pond liner and still the cost benchmark. The same 45-mil thickness as premium brands at a better price per square foot. The right choice if you're digging a large pond and watching material costs.

Liner and underlayment together in matched sizes — no separate ordering, no sizing guesswork. The underlayment protects against root and rock puncture. Ideal for first-timers who want one less decision during the build.

The AquaForce is built to pass solid waste and debris without clogging — critical in a koi pond where uneaten food and fish waste enter the system constantly. Rated 2,000 GPH, energy-efficient for 24/7 use, and backed by Aquascape's warranty. The right pump for a 1,500–2,000-gallon starter koi pond.

For a smaller starter pond under 800 gallons, TetraPond's entry pump gets the job done without overkill spending. Reliable brand, straightforward setup, adequate flow for a modest beginner setup.

Koi need 7+ ppm dissolved oxygen — which drops fast when water temperatures exceed 70°F in summer. This dedicated air pump and diffuser adds dissolved O2 independent of your main pump. Cheap insurance against summer oxygen crashes, which can kill an entire pond overnight.

The API Pond Master tests the four parameters that matter most: ammonia, nitrite, nitrate, and pH. Liquid drop tests are more accurate than test strips and cost less per test over a full season. This is the kit every koi keeper references in every forum and Facebook group.

Quick-dip strips that give a 30-second read on six parameters. Not as precise as liquid tests on ammonia and nitrite, but useful for routine monitoring between full test-kit sessions. Keep a roll by the pond for fast daily checks.

Neutralizes chlorine, chloramine, and heavy metals instantly when you add tap water to the pond. Also contains aloe vera that promotes the natural slime coat koi need to resist infection and recover from handling. Add it every time you top off or do a water change.

The food serious koi keepers fall back on after trying the competition. 35% protein, floating pellets, digested cleanly so less waste enters the system. Blue Ridge is what comes up when you ask any experienced keeper for a single honest answer on staple food.

The most widely available koi food in the US. A reasonable everyday option when budget matters — won't match Blue Ridge for growth or waste efficiency, but it won't hurt your fish either. Good emergency backup to keep on hand.

Hikari is the Japanese koi food benchmark — developed alongside championship nishikigoi breeders. The Gold formula enhances color and contains probiotic bacteria that improve digestion and reduce waste. When you're ready to care about fish quality and presentation, this is the upgrade.