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Williams Sinclair are the market leader in this grade of Perlite
Sinclair Perlite Standard 2.0mm – 5.0mm. ... The air trapped in the perlite is insulated from temperature variations and therefore helps stabilise the compost temperature. Sinclair Perlite has a neutral pH of between 6.5 – 7.5, is chemically and biologically stable and does not lock up or promote nutrient release.
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