Why Brass Fittings Don't Belong in Your Aquarium?

Using brass fittings in aquariums is generally not recommended, especially for freshwater or sensitive fish and invertebrates. Here’s why:

Why Brass Can Be a Problem:

1. Brass Contains Copper:
   • Brass is an alloy of copper and zinc. Even if it’s labeled “lead-free,” it can still leach copper ions into the water over time.
   • Copper is toxic to many aquatic animals, especially:
     • Shrimp and other invertebrates
     • Snails
     • Some species of fish (like scaleless fish or fry)
2. Corrosion in Water:
   • Brass will corrode over time in the presence of water, especially saltwater, accelerating the leaching of metals.
   • Corrosion can also lead to contamination or mechanical failure of the fitting.

Acceptable Alternatives:

• Plastic (PVC or CPVC) — Safe, inexpensive, non-toxic, corrosion-resistant.
• Stainless Steel (Grade 316) — If you absolutely need a metal, 316 stainless steel (marine grade) is much more corrosion-resistant and aquarium-safe.
• Food-Grade Silicone Tubing — Good for flexible connections and non-reactive.

If You Must Use Brass:

If you already have brass components:

• Use them outside the water line (e.g., in external plumbing).
• Consider applying a food-grade epoxy coating to seal it — but this must be aquarium-safe and fully cured.
• Test copper levels regularly if any water passes through the brass.

Summary:

Avoid brass fittings in aquarium systems. Choose PVC, CPVC, or stainless steel (316) instead for safety and long-term health of aquatic life.

Of course if you are looking for brass PVC fittings, you can check them out here!