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A fairly new media which is graded 2mm to 4mm. Like Pumice and Lava, LavaLec®La is porous, inorganic and inert with a neutral PH and has good moisture and nutrient retention properties and like Pumice and Lava, the fine roots of plants will grow in to this media and split. LavaLec®La will release water and nutrients at a different rate to Akadama and Pumice and when mixed with Akadama, will help to slow down the breakdown of Akadama due to freezing and thawing. It is a fairly hard media which will resist break down due to freezing and thawing. Like Pumice and Lava, LavaLec®La should not be used on its own as a growing media in the UK and needs to be mixed with other media. The properties and advantages of LavaLec®La are quite similar to Lava, with very similar water retention / release properties and therefore I believe that it is a good and much cheaper alternative for both Lava and Kyodama.