Product Information

API Phos-Zorb Large Pouch – High-performance phosphate and silicate removal media for freshwater, planted, marine, and reef aquariums. Helps reduce algae growth, improve water clarity, support coral health, and remove compounds that inhibit aquatic plant growth. One large pouch treats aquariums up to approximately 208 litres (55 US gallons).

API Phos-Zorb Large Pouch – Remove Phosphate & Silicate for Clearer Water, Healthier Plants and Corals

Phosphate is one of the leading causes of nuisance algae in aquariums. It enters the water through fish food, fish waste, decaying organic matter and even tap water. Silicate contributes to brown diatom outbreaks, especially in new aquariums.

API Phos-Zorb is a ready-to-use chemical filtration media that selectively removes phosphate and silicate, helping maintain crystal-clear water while reducing nutrients that fuel algae growth.

In freshwater aquariums, it removes compounds that may inhibit aquatic plant growth. In marine and reef aquariums, lowering phosphate supports healthier hard and soft corals by reducing one of the major causes of poor coral growth and excessive algae.

Why Aquarists Choose API Phos-Zorb

• Removes phosphate (PO₄)
• Removes silicate
• Helps reduce green algae and brown diatoms
• Improves water clarity
• Supports healthy coral growth
• Helps planted aquariums by removing growth-inhibiting compounds
• Suitable for freshwater, marine and reef aquariums
• Ready-to-use filter pouch
• Fits most canister, sump and power filters
• Made in USA

When Should You Use API Phos-Zorb?

• During algae outbreaks
• When phosphate tests above 0 ppm
• When silicate exceeds 0.5 ppm
• In reef aquariums with elevated phosphate
• During brown diatom blooms
• If tap water contains phosphate or silicate
• To improve long-term water quality

Replace the pouch approximately every 2 months, or sooner if phosphate testing indicates it is exhausted.