PRO-MIX® CPX AGTIV® REACH™ Growing Medium — 15 lb (50L) Loose Fill | 70/30 Coco Coir & Perlite | OMRI Listed®

OMRI Listed® 70/30 Coco Coir & Perlite Growing Medium for Superior Drainage and Root Zone Aeration

Key Features & Benefits

• 70% Coco Coir / 30% Horticultural-Grade Perlite: Precision-blended ratio combines premium coir’s moisture retention with perlite’s drainage and aeration properties, creating a lightweight, high-porosity medium with 60–65% water retention and faster dry-back compared to pure coco substrates.
• OMRI Listed®: Certified for use in organic growing programs, allowing producers under USDA NOP and equivalent organic standards to incorporate CPX into certified production systems with confidence.
• AGTIV® REACH™ Mycorrhizae: Beneficial endomycorrhizal inoculant supports rapid root colonisation, expands effective nutrient absorption area, and improves plant tolerance to stress across a wide range of crops and growing environments.
• Enhanced Air-Filled Porosity: The 30% perlite fraction creates larger pore spaces that increase oxygen availability at the root zone, supporting vigorous root development and reducing the risk of anaerobic conditions under high-frequency irrigation programs.
• Lightweight 15 lb (50L) Loose Fill Bag: Perlite reduces overall bulk density compared to pure coco, making filled containers easier to handle. Ready to use without rehydration — practical for transplanting and high-throughput container filling workflows at any production scale.
• Sustainable Coco-Based Substrate: Formulated with coco coir, a renewable by-product of coconut processing, providing an environmentally responsible alternative to peat for growers prioritising sustainable production inputs.

Who Should Use This

PRO-MIX® CPX AGTIV® REACH™ is ideal for high-value crop producers, certified organic growers, and CEA operators who run aggressive fertigation programs or high-frequency drip systems requiring a substrate with fast dry-back response and strong aeration. It is especially well-suited to growers who have experienced overwatering challenges with pure coco substrates or who prefer a lighter, more aerated root zone medium for containers, grow bags, and production trays.

Compatibility

Compatible with liquid mineral, organic, and hydroponic nutrient solutions. The 70/30 coco/perlite profile performs well in high-frequency drip-to-waste and recirculating systems where accelerated drainage and rapid oxygen replenishment between irrigation events are production priorities. Suitable for plastic containers, fabric pots, open-top grow bags, and standard propagation trays. OMRI Listed® for compliance with most North American organic certification standards.

Frequently Asked Questions

How does CPX differ from pure coco (CCX) in terms of irrigation management?

CPX’s 30% perlite fraction creates larger drainage pore spaces, resulting in faster dry-back between irrigations compared to CCX (60–65% vs. 70–75% water retention). This makes CPX the better choice when growers want more precise control over wet/dry cycles, faster oxygen replenishment in the root zone, or are running high-frequency drip programs that deliver nutrients in shorter, more frequent bursts.

Does the perlite content in CPX affect pH stability?

Horticultural-grade perlite is pH neutral and does not significantly alter the overall pH profile of the coco blend. As with all coco-based substrates, growers should monitor and adjust nutrient solution pH to maintain optimal nutrient availability for their specific crop species and growth stage.

Is PRO-MIX® CPX suitable for seedling and propagation use?

Yes. CPX’s lightweight, well-aerated structure makes it suitable for seedling production and propagation transplant plugs. The low bulk density reduces mechanical resistance for emerging roots, and the perlite fraction helps prevent waterlogging in propagation cells and small starter containers.

Does CPX require buffering or conditioning before first use?

Like CCX, PRO-MIX® CPX has been pre-processed to reduce sodium and potassium content common in raw coco coir. Growers using calcium-sensitive nutrient programs should monitor Ca/Mg levels during early crop establishment to confirm the substrate is performing optimally with their specific feed strategy.

How does CPX’s weight compare to CCX and why does it matter commercially?

CPX (15 lb / 50L) is lighter than CCX (17 lb / 50L) due to perlite’s lower bulk density compared to coco fiber. For large-scale indoor cultivation operations filling hundreds or thousands of containers per cycle, this weight difference meaningfully reduces physical labour and logistics handling costs over the course of a full production season.