Agricultural Lagoon Fill

Reduce Ammonia and Methane with Leca® Aerotop

Leca® Aerotop is a scientifically proven solution to tackle the issue of odour at their source and has been proven to significantly reduce harmful gas emissions. This innovative material floats on the surface of lagoons, storage tanks and run off areas to control the release of Hydrogen Sulphide (H2S), Ammonia, Methane and other odours* 

Leca® Aerotop is an innovative ceramic bulk material that can be added to the surface on a slurry tank or lagoon to form a floating layer. Leca® Aerotop is a product that tackles the issue of odour at their source and has been proven to significantly reduce harmful gas  emissions. 

This  innovative  material  floats  on  the  surface  of  lagoons, storage tanks and run off areas to control the release of Hydrogen Sulphide (H2S), Ammonia, Methane and other odours*.The Scientific Innovation of Leca® AerotopThe gas emission removal system is created by a catalyst reaction on the Leca® Aerotop surface, which contains iron oxide and other metal oxides. This means that the emission removal solution and performance will last – preventing the release of harmful gases and odour into the surrounding area.The lightweight nature of Leca® Aerotop means that the aggregate simply floats on the surface of the lagoon or slurry tank, making it  a  cost  effective,  quick  and  simple  solution  in  the  prevention  of  harmful  gases  and  odour. 

The  iron  oxides  in  the  clay  mineral  structure acts as a catalyst for chemisorption of Hydrogen Sulphide (H2S), Ammonia, Methane and other organic compounds. The Leca® Aerotop floating cover solution can significantly reduce the  capital  costs  involved  in  digestate  storage  solutions,  while  offering significant  financial  returns  through  the  retention  of  nitrogen.

Leca® Aerotop also reduces the financial costs required for the  on-going  maintenance  required  for  alternative  types  of  covers such as floating plastic covers and other fixed covers, which depending on the size of the lagoon can be extremely expensive, time intensive and difficult to install.

Lagoon Fill
Lagoon Fill
Lagoon Fill
Lagoon Fill

We have accumulated a wealth of experience over the past 20 years in successfully transporting and delivering Leca® Aerotop to diverse agricultural projects throughout the UK and Ireland. Depending on the project, we can source the vehicles that best suit the project requirement. This also includes the popular and innovative pneumatic blowing delivery,  which can deliver Leca® Aerotop in difficult terrain and can be blown in at a distance of up to 40 metres allowing for greater flexibility and aiding environmental consideration to a variety of access and constructional challenges.

This can be pneumatically delivered to  provide  immediate  coverage  to  a  lagoon.  Another  popular  method of delivery is through tote bags (2.2m3 volume), which again make it easy to transport onto site.

How can Leca® Aerotop help?

Leca® Aerotop is the only lightweight aggregate with a granularity of 10-20 mm and has a bulk density that does not exceed 300 kg / m3. As suggested by the Department for Environment Food &  Rural  Affairs  (DEFRA),  in  the  Government  document  ‘Code  of  Good  Agricultural  Practice  (COGAP)  for  Reducing  Ammonia  Emissions’, using  lightweight  expanded  clay  aggregate  as  a  floating  cover  solution  can  provide  an  effective  protective  layer  against dangerous emissions including Hydrogen Sulphide (H2S), Ammonia and Methane into the surrounding environment.

Cost effective, Simple and Quick solution

Manufactured  by  Leca  in  its  unique  kilns,  Leca®  Aerotop  is  a  Lightweight  Expanded  Clay  Aggregate  that  offers  many  fundamental  properties  which  make  it  a  perfect  solution  for  lagoon cover. Leca® Aerotop is a flexible and quick solution helping to reduce the build-up of crusting.

A 10cm layer of Leca® Aerotop poured over slurry limits the emission of harmful gases and foul odours by up to 85%*.


  • Easy to implement - just pour Leca® Aerotop over the slurry
  • Long lasting solution - fully resistant to chemical    compounds
  • Lightweight - no excessive load on the tank construction
  • Cost reduction - less expensive than traditional     reinforced concrete covers and tent roofing.
  • Reduces foul smell and gas emissions by up to 85%
  • Protects and keeps nutrients within the slurry

Reduce Ammonia Emission

Interview with Farming Specialist on the 2027 UK Clean Air Strategy (for Farming)

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