CT‑404 – adjustable aerator

The SunSun CT-404 is an air pump for aquarists who need steady aeration and want to adjust its output to the tank. It replaces CO2 in the water with oxygen from the air, which helps keep oxygen levels and pH stable for fish and plants.

Why it matters

• Stepless power regulation: the output can be adjusted continuously, so aeration can be tuned to the stocking and the oxygen and CO2 balance of the aquarium.
• Four outlets: the pump feeds four air lines, each rated at 2.8 l/min, for multiple air stones or diffusers.
• Low power draw: it runs at 8 W, and the redesigned coil with more windings in the same volume contributes to this.
• Vibration damping: soft rubber feet and a rubber hanger keep vibration from transferring to the surface the pump stands on or hangs from.

Specifications

• Power consumption: 8 W
• Pressure: 0.016 MPa
• Output: 4 x 2.8 l/min
• Number of outlets: 4
• Dimensions: 17.3 x 16 x 7 cm
• Weight: 1.35 kg

What it works with

The CT-404 is listed in the underwater exotic category, so it is intended for aquarium setups rather than dry terraria. Its four outlets make it suitable for tanks that need several air points, with the output adjusted to the volume and livestock. Use it together with air stones or diffusers fitted to the air lines.