Filter media Tetra NitrateMinus Pearls 250 ml – nitrate reduction for outdoor aquaria and ponds

Tetra NitrateMinus Pearls 250 ml is a granular filter media for outdoor aquaria and garden ponds, designed to reduce nitrate concentration over an extended period. The product is intended to be worked into substrate or filter beds where it supports biological nitrate reduction, lowers a key nutrient for algae and contributes to improved overall water quality with less maintenance effort.

Advantages

The pearlescent granules provide biological nitrate reduction for up to 12 months and are continually degraded by bacteria as they work in the substrate. Regular use leads to a long-term decrease in nitrate levels, which helps to restrict algae growth and stabilise water parameters. Application is simple because the granules are introduced into the gravel or filter media and remain out of sight.

Suitable for

• Outdoor aquaria
• Garden ponds
• Freshwater and marine pond filtration systems
• Setups where long-term nitrate control is required

When it may not be suitable

The product is not a rapid emergency treatment for dangerously high nitrate spikes; it is formulated for gradual, long-term reduction. Results depend on specific aquarium or pond conditions, so additional water management or mechanical filtration may still be necessary in heavily stocked or polluted systems.

Key specifications

• Form: granulated pearlescent beads
• Volume: 250 ml
• Function: biological nitrate reduction
• Effective duration: up to 12 months under normal conditions
• Typical target nitrate range after treatment: below 40–50 mg/l (dependent on conditions)
• Application: worked into gravel or filter media

How to use

Introduce the granules into the gravel layer or place them in the filter bed according to filter manufacturer guidance. The product is designed for continuous action and should be left in place; a new dose is recommended every 12 months. If a stronger effect is required, the dosage may be increased up to twice the standard amount. Follow routine pond or aquarium maintenance and water tests to monitor nitrate reduction and overall water quality.

What to consider before purchase

• Intended use: outdoor aquaria and garden ponds
• Not a fast-acting emergency nitrate remover
• Effectiveness depends on stocking levels and pollutant load
• Requires placement in substrate or filter media

Usage recommendations

Use one 250 ml pack per appropriate volume of filter or substrate as advised for your filtration system; check nitrate levels regularly and repeat dosing annually or increase dose if faster reduction is needed.