Grech CTP-16000 Amphibious Pond Pump – 16,000 L/h, 7.5 m Head, 140W

The CTP-16000 sits at the top of Grech's amphibious range, and the reason to choose it over a conventional pond pump is efficiency. It moves 16,000 litres an hour on 140 watts. A pond pump runs continuously, so wattage compounds, every 5 W you save is roughly 44 kWh over a year, and at this flow rate the CTP series is among the leanest on the market.

Amphibious means it runs wet or dry

Most pond pumps must stay submerged or they burn out. This one can sit in the water or be plumbed in externally alongside the pond, which matters if you want the pump out of the water for easier servicing, or if you are feeding a pressurised filter from a dry chamber. It handles fresh and salt water, so it suits marine tanks and seafood holding systems as well as koi ponds.

Reading the flow and head figures

These two numbers describe the pump at opposite extremes. The 16,000 L/h figure is measured at zero head , the outlet level with the water surface. The 7.5 m figure is the shut-off head, the height at which the pump can no longer lift water and flow drops to nothing. Actual output falls between the two, declining as lift increases. If you are feeding a waterfall or a filter above pond level, size on the flow you need at your actual lift height, not on the headline figure.

Matching it to your filter

Worth saying plainly: do not oversize the pump against your filter. Pushing more water through a filter than it is rated for causes it to overflow, and on a pressurised unit it puts the housing under strain. If this pump exceeds what your filter can take, fit a Y-adapter and bleed the excess back into the pond.

Specifications

• Maximum flow: 16,000 L/h at zero head
• Maximum lift (shut-off head): 7.5 m
• Power consumption: 140 W
• Supply: 230 V, 50 Hz
• Hose adaptors: 1", 5/4", 3/2" and 2"
• Dimensions (L × W × H): 208 × 138 × 158 mm
• Weight: 3.7 kg
• Ingress protection: IPX8
• Shaft: ceramic, corrosion and wear resistant
• Water types: fresh and salt water

Typical Applications

• Large agricultural irrigation systems
• Aquaponics, Aquaculture and fish farming operations
• Reservoir and bulk tank water transfer
• Hydroponic and recirculating systems
• Industrial water circulation
• Drainage and flood control (low to medium head scenarios)

Servicing

The pump strips down by hand for cleaning — no tools, no specialist parts. The ceramic shaft is the component that usually kills cheaper pumps through corrosion, and it is the reason this range tends to outlast its price bracket.