Green water, free-floating parasites, and algae spores circulate through even a well-filtered tank, since standard filtration doesn't kill what's suspended in the water column. The IceCap In-Sump UV line controls that chemical-free, in 18w and 27w models for smaller and mid-size systems.
Why UV Sterilization Helps
Mechanical and biological filtration process waste and particles, but they don't neutralize free-floating pathogens or algae cells passing through the water. UV exposure knocks down free-floating parasites, algae, and bacteria in a way filtration alone can't.
Choosing a Size
- In-Sump 18w UV Sterilizer - the entry point to IceCap's UV lineup, built for saltwater, freshwater, and pond systems wanting a chemical-free way to control green water and pathogens.
- In-Sump 27w UV Sterilizer - steps up UV output for larger in-sump systems, giving chemical-free control over free-floating parasites, algae, and bacteria at higher flow rates.
For larger systems, we've covered the In-Sump 40W UV Sterilizer in a separate sizing guide.
Setup Tips
- Size wattage to your water volume and flow rate - too fast a flow through the unit reduces UV contact time.
- Replace the UV bulb on schedule even if it still lights up, since output drops well before visible failure.
- Position inline with existing filtration for consistent water passage.
The IceCap In-Sump UV Sterilizer is available at Marine Concept Supply - order online or pick up at our shop in Wheeling, IL. Shop 18w or 27w, and browse more UV sterilizers.
