{"product_id":"professor-s-nutrients-premium-coco-5kg-brick-compressed-rhp-certified-substrate","title":"Professor’s Nutrients - Premium Coco 5kg Brick – Compressed RHP Certified Substrate","description":"\u003csection\u003e\n\u003ch3\u003eProfessor’s Nutrients - Premium Coco 5kg Brick – Compressed RHP Certified Substrate\u003c\/h3\u003e\n\u003cp\u003eFor growers looking to maximise storage efficiency and reduce shipping costs without sacrificing media quality, the Professor’s Nutrients Premium Coco 5kg Brick is the ultimate choice. This product contains the exact same world-class, RHP certified, 100% Pure Blend coco coir found in the premium 50L loose bags. Compressed for ultimate portability, this 5kg block is cleverly split into two independent 2.5kg halves wrapped securely together, allowing you to hydrate only what you need. Upon expansion, this single brick yields an impressive 60+ litres of airy, clean, and pre-buffered growing medium, giving your root systems the optimal environment for explosive development.\u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cstrong\u003eBest For:\u003c\/strong\u003e Space-conscious growers, remote or rural delivery orders, commercial operations looking to minimise storage footprints, and high-performance hydroponic cultivation.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRHP Certified Premium Quality:\u003c\/strong\u003e Guaranteed to be entirely free from pathogenic germs, soil-borne diseases, weeds, and heavy metals. This professional horticultural standard ensures an ultra-clean, consistent crop cycle every time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmart Split 2-in-1 Design:\u003c\/strong\u003e Comprises two separate 2.5kg bricks wrapped as one. This allows you to break off and rehydrate exactly half the brick (approx. 30L) while keeping the remaining half completely dry and neatly stored for later use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMassive 60+ Litre Expansion:\u003c\/strong\u003e Despite its compact, lightweight shipping profile, a full 5kg brick rapidly expands to deliver over 60 litres of premium-grade, loose coco coir when water is added.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWashed \u0026amp; Pre-Buffered:\u003c\/strong\u003e Thoroughly processed to rinse out excess sodium and potassium salts. The pre-buffering ensures the cation exchange sites are charged with Calcium and Magnesium, eliminating early-stage nutrient lockout.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Water Absorption \u0026amp; Aeration:\u003c\/strong\u003e Naturally retains moisture and dissolved nutrients while maintaining an open, fibrous structure that allows oxygen to flood the root zone, preventing root rot and over-watering issues.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStable Hydroponic Baseline:\u003c\/strong\u003e Features an ultra-low background EC and a stable pH baseline (5.5 - 6.5), giving you a neutral \"blank canvas\" to dial in your specific nutrient solution.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Professor’s Nutrients\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 5kg (Composed of 2 x 2.5kg halves)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpanded Volume:\u003c\/strong\u003e Over 60 Litres of loose coir per brick\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003epH Range:\u003c\/strong\u003e 5.5 – 6.5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertification:\u003c\/strong\u003e RHP Certified for Commercial Horticulture\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 100% Natural, Eco-Friendly Coconut Husk Coir\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHydration \u0026amp; Usage Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Rehydration Process:\u003c\/strong\u003e Place a 2.5kg or 5kg block inside a large tub or a clean wheelbarrow. Slowly add warm water to accelerate expansion. A full 5kg brick will require roughly 20–25 litres of water to fully hydrate and fluff up.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCharging the Medium:\u003c\/strong\u003e While expanding the brick with plain water works perfectly, you can give your plants a head start by hydrating the block using a very weak, half-strength nutrient solution mixed with a premium root stimulant. This immediately \"charges\" the media with bio-available nutrients.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRunoff Management:\u003c\/strong\u003e When growing in pure coco, always aim for a 10–20% runoff with each liquid feed. This flushes away any built-up mineral salts from the pot and ensures fresh oxygen is continuously drawn into the root network.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerlite Blending:\u003c\/strong\u003e For an even faster-draining media suited for high-frequency automated dripper systems, blend the expanded coco with 30% premium perlite. This creates an ultra-aerated mix that is almost impossible to over-water.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eIdeal For (Uses)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommercial Facilities:\u003c\/strong\u003e Minimising warehouse storage space, as compressed bricks take up a fraction of the pallet space compared to loose-fill bags.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRun-to-Waste Hydroponics:\u003c\/strong\u003e Providing a sterile, reliable substrate for automated drip and flood irrigation systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCloning \u0026amp; Potting Up:\u003c\/strong\u003e An ideal, pathogen-free medium for introducing unrooted cuttings or transplanting young seedlings into their final pots.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"Holland Forge","offers":[{"title":"Default Title","offer_id":48419933388900,"sku":"4310","price":30.99,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0713\/6487\/0244\/files\/ChatGPTImageMay16_2026_02_33_42AM.png?v=1778870274","url":"https:\/\/www.greenhousepolytunnels.com.au\/products\/professor-s-nutrients-premium-coco-5kg-brick-compressed-rhp-certified-substrate","provider":"Greenhouse \u0026 Polytunnels","version":"1.0","type":"link"}