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Expanded Clay Balls

Expanded clay balls are pellets of inert clay that have been fired to create small marble-sized balls that can be used in hydroponic growing systems. Also sometimes known as LECA (lightweight expanded clay aggregate) or hydroton.


Expanded Clay or LECA (lightweight expanded clay aggregate) is an excellent growing medium which can be used in aquaponic farming, hydroponic growing systems, and conventional soil-based agriculture too.

Suitable medium for use in flood and drain or nutrient film technique hydroponic systems.

Note: Requires an initial wash to rinse clean. Soak for a few hours and stir around before draining.

For more information on growth mediums, check out our blog post on hydroponic growth mediums.

  • Clay balls range from 8mm-16mm in diameter
  • Packaged in cardboard (to reduce plastic waste)
  • Easy to use and mess-free
  • Neutral pH
  • Inorganic and inert
  • The surface of the clay has tiny holes all over its surface. This allows better root aeration and increases the available surface area for nitrate crunching bacteria to grow (perfect for aquaponic systems).
  • The nutrient water will dry out before the nutrients have the chance to turn to algae.

Customer Reviews

Based on 29 reviews
Samantha S.
100% Would recommend

Whilst I don't use the Leca in its typical fashion as I love soil; I use it to create a drainage layer/ reservoir for my alocasias that like to stay moist, and as a replacement for orchid bark in my potty mix to make it more chunky; and the product as been excellent. Very high quality, haven't had any issues at all.

Highly recommend

Looks amazing!

Gabrielle T.
Expanded Clay Balls

Very easy to use, love that there is no mess! Easy to clean - just rinse in a colander!

Tim M.
Clayballs review

This is the first time I’m using this type of product and so far I’ve been happy with the results. The plants are surviving.

Lyzyll S.
Love this product!!

Honestly I was a bit skeptical this product, but I really loved it using it with hydro plants and a plant topper to prevent pests does the trick. Would 100% reccommend.