{"product_id":"hydrofarm-grow-t-gmc40l-clay-pebbles-40l-brown-hydroponics-aquaponics-drainage-media","title":"Hydrofarm GROW!T GMC40l Clay Pebbles 40L Brown – Hydroponics, Aquaponics \u0026 Drainage Media","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\u003cp\u003eGROW!T GMC40l clay pebbles are crafted from 100% natural clay. They are clean, pH stable, and designed to deliver dependable aeration and drainage across hydroponic systems. Their unique structure creates a large surface area around the root zone, supporting the development of beneficial microbial activity and a stable environment for roots to explore nutrients from their surroundings.\u003c\/p\u003e\u003ch3\u003eWhat you may notice in practice\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eExtremely stable in both pH and EC, helping you maintain steady nutrient conditions without frequent adjustments.\u003c\/li\u003e\n\u003cli\u003ePre-washed to aid stability and reduce handling dust during setup.\u003c\/li\u003e\n\u003cli\u003eDrain freely and do not hold excess water, providing consistent oxygen levels near the roots.\u003c\/li\u003e\n\u003cli\u003eMade from 100% natural clay and sized 4 mm to 16 mm for versatile uses across systems.\u003c\/li\u003e\n\u003cli\u003eWill not float once fully wet, helping media stay in place during cycles.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003ePractical uses across growing styles\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eAeration and drainage: mix into coco coir or soil to improve air gaps and root comfort.\u003c\/li\u003e\n\u003cli\u003eHydroponics and hydroculture: ideal for flood and drain, deep water culture, and drip systems.\u003c\/li\u003e\n\u003cli\u003eAquaponics: suitable for root media in combined fish-plant systems.\u003c\/li\u003e\n\u003cli\u003eDecoration and evaporation control: top dressing adds a natural look while reducing evaporation.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIn daily use, you receive a 40 liter bag of brown pebbles that stay stable under typical growing conditions. The pebbles are not only functional but also visually appealing when used as a top layer or decorative bed cover. The 4–16 mm sizing offers versatility for different root zones, while the natural clay composition provides a consistent medium across environments.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What makes GROW!T GMC40l clay pebbles suitable for hydroponics?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: They are 100% natural clay, pH stable, and deliver strong aeration and drainage, helping roots stay oxygenated and reducing stagnant zones.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How should I use the GMC40l pebbles in different systems?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Use as drainage media, mix into coco coir or soil to improve aeration, or top-dress; they perform well in flood and drain, DWC, and drip feeds.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Hydrofarm","offers":[{"title":"Default Title","offer_id":48216750358772,"sku":"B00MHQ0IHA","price":73.66,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/6652\/0820\/files\/hydrofarm-growit-gmc40l-clay-pebbles-40l-brown.jpg?v=1778612358","url":"https:\/\/www.cerapatiogarden.com\/products\/hydrofarm-grow-t-gmc40l-clay-pebbles-40l-brown-hydroponics-aquaponics-drainage-media","provider":"Cera Garden","version":"1.0","type":"link"}