Phosguard

Take control of nuisance algae and improve water quality with Seachem PhosGuard 500 mL.

PhosGuard is a fast acting filtration media designed to remove phosphate and silicate from aquarium water two key contributors to algae growth. By reducing excess nutrients, it helps restore balance, improve clarity, and create a healthier environment for fish and invertebrates.

Ideal for both freshwater and saltwater aquariums, PhosGuard is an easy and effective solution for keeping your tank clean and under control.

What It Does

• Removes phosphate (PO₄) and silicate (SiO₂)
• Helps reduce algae growth
• Improves water clarity
• Supports a cleaner, more stable aquarium

Why It Matters

Excess phosphate is one of the leading causes of nuisance algae.
By removing it from the water, PhosGuard helps prevent outbreaks and keeps your tank looking clean and balanced.

Perfect For

• Aquariums experiencing algae issues
• Freshwater and saltwater tanks
• Reef tanks (use as directed)
• Routine filtration support

Features

• Fast acting phosphate remover
• Works in most filters, media bags, and reactors
• Easy to use and replace
• Targets nutrients that fuel algae growth

Size

• 1L

Pro Tip

Place in a media bag in a high flow area of your filter for best results. Monitor phosphate levels regularly to avoid over removal.