OB Substrate's 60/40 Coco Clay 50L


The OB Substrates ​60/40 media contains a 40% blend of OB's pure coco coir & 60% clay pebbles which provides many advantages for the modern gardener using automated system like flood & drain. By combining the clay pebbles at a 60% ratio massively increases drainage and aeration within the rootzone, this makes it possible for more aggressive feeding programs to be implemented without the fear of overwatering as free draining is maximised, the fear of overwatering will be a thing of the past. Plants will have a constant supply of fresh, cool air with as much nutrients as the coco coir can hold while the excess drains through. The increased air within the medium provides greater root transpiration, respiration & feeding which accelerates both vegetive & flowering stages.

Within its natural state, coco coir can have a negatively charged complex surrounded by Sodium and Potassium. Unbuffered coco coir has too much Sodium which displaces Calcium from any applied nutrients and disrupts the nutrient balance by reducing Calcium availability, OB Substrates Coco Pure Organic Plant Medium solves that problem as it is pre-buffered with Calcium which flushes the Sodium from the coco coir while being washed and pH stabilized at source.

OB Substrates Coco has been awarded the coveted Dutch RHP certification, an international indication of high quality. Substrates that carry the RHP quality mark in horticulture satisfy the highest chemical and physical requirements, this all to guarantee a safe and reliable application for the grower. The RHP certification ensures that the coir maintains the highest level of consistency and quality, is pest and disease free, thoroughly rinsed, pH stabilized, pre-buffered with calcium, and has a very low salt content.


Coco Clay 60/40 mix will supercharge your plant's root zone by huge amounts of oxygen, when oxygen is more accessible your plants have an increased chance to withstand extreme conditions.


Coco coir is well known for its superior water-holding capabilities, while clay pebbles drainage properties are amongst the best. The combination of coco and clay pebbles permits excess water and unused nutrient solution to drain away more freely while still maintaining the essential amount of moisture needed for ideal growing conditions which permits more aggressive feeding.

  • 50 Litre bag.
  • Washed & Pre-Bufered
  • Clean & pest FREE
  • Ideal pH Range 5.5 ~ 6.5
  • Very LOW EC Value
More Information
Product NameOB Substrate's 60/40 Coco Clay 50L
Volume (ml/ltr/gallon)50 LITRE
  • Orders are despatched in discreet plain packaging for security & discretionary purposes.
  • Our shipping partners are DHL & Royal Mail as reliable as they are we cannot be held accountable for delays or mistakes cause by their organizations however we will assist on rare occasions this happens.
  • FREE delivery is DHL 48HR delivery service up to 30KG based upon Each £65.00 of purchases.
  • We aim for ALL orders & cleared funds received before 2PM to be dispatched the same day on the next working day service with DHL or 48HR (DHL FREE) service with Royal Mail, in rare circumstances we cannot full fill this service we will notify the customer advising of the situation and an estimated time frame. (FULL SHIPPING INFORMATION).
  • SECURE PAYMENTS processed By PayPal & Klarna as our online payment gateways with funding options also available through both options. (FULL PAYMENT INFORMATION).
Steel Roots Garden Supplies operates within the distance selling regulations. You may cancel your order & return your items to us for a full refund under the following conditions:
  • The goods have been delivered to your provided delivery address for up to 14 working days (dis-count weekends & UK national holidays) after the day delivery take's place.
  • Goods must be in their original condition, unopened & ready for resale by us. (FULL RETURN INFORMATION).