ZeroFour has been evaluated in a range of saltwater aquarium systems, from a 13-gallon personal reef to a 130-gallon display tank.

Across these four user case studies, ZeroFour was placed directly into the aquarium filtration system and phosphate concentration was monitored over seven days.

The tanks varied in size, filtration configuration, and starting phosphate concentration, providing a look at how ZeroFour performed under different reef-keeping conditions.

130-Gallon Display Reef

Starting phosphate: 0.38 ppm
ZeroFour dose: 100 g
Placement: Sump

A 130-gallon saltwater display reef was treated with 100 grams of ZeroFour placed in the sump.

Phosphate concentration decreased from 0.38 ppm on Day 0 to 0.08 ppm by Day 3, reaching 0.05 ppm on Day 4. The measured phosphate concentration at the end of the seven-day period was 0.08 ppm.

Tank specifications

• Tank size: 130 gallons

• Water type: Saltwater

• Filter type: Sponge filter

• Lighting: LED

• Initial phosphate removal rate: 0.10 ppm/day

32-Gallon LPS & Soft Coral Tank

Starting phosphate: 0.37 ppm
ZeroFour dose: 32 g
Placement: Sump

In this 32-gallon LPS and soft coral aquarium, phosphate concentration declined from 0.37 ppm to 0.10 ppm within three days.

The lowest measured phosphate concentration was 0.04 ppm on Day 5, with the seven-day measurement ending at 0.08 ppm.

Tank specifications

• Tank size: 32 gallons

• Water type: Saltwater

• Filter type: Sump

• Lighting: LED

• Phosphate removal rate: 0.09 ppm/day

45-Gallon Coral Flat

Starting phosphate: 0.90 ppm
ZeroFour dose: 45 g
Placement: Sump

The 45-gallon coral flat began with the highest phosphate concentration of the four case studies.

Over the seven-day test period, phosphate concentration decreased steadily from 0.90 ppm to 0.24 ppm.

Measured phosphate levels declined throughout the test:

0.90 → 0.78 → 0.66 → 0.55 → 0.44 → 0.35 → 0.26 → 0.24 ppm

Tank specifications

• Tank size: 45 gallons

• Water type: Saltwater

• Filter type: Sump

• Lighting: LED

• Phosphate removal rate: 0.11 ppm/day

13-Gallon Personal Reef

Starting phosphate: approximately 0.24 ppm
ZeroFour dose: 20 g
Placement: AIO chamber

ZeroFour was also tested in a compact 13-gallon all-in-one reef aquarium.

Phosphate concentration decreased rapidly during the first several days, falling from a plotted 0.23 ppm on Day 0 to 0.05 ppm on Day 2 and approximately 0.04 ppm by Day 3.

The phosphate concentration remained below 0.10 ppm through the end of the seven-day test period.

Tank specifications

• Tank size: 13 gallons

• Water type: Saltwater

• Filter type: AIO chamber

• Lighting: LED

• Phosphate removal rate: 0.10 ppm/day

The PowerPoint lists the initial phosphate concentration as 0.24 ppm, while the Day 0 graph value is 0.23 ppm.

Designed to Fit Into Existing Filtration

ZeroFour can be incorporated into common reef aquarium filtration configurations, including:

• Sump systems

• Media chambers

• All-in-one aquarium filtration compartments

This allows reef keepers to incorporate ZeroFour into their existing system without requiring a dedicated phosphate reactor.

Manage phosphate. Reuse the media. Maintain your reef.