I posted this information in another thread, but I'm placing the information here so it can be easily found. EDTA EDTA, created in 1935, is a persistant organic pollutant (or POP). https://en.wikipedia.org/wiki/Persistent_organic_pollutant EDTA is not biodegradeable, is fossil-fuel based, is resistant to removal in sewerage treatment, is able to mobilize heavy metals in the environment and is toxic to aquatic life ... definitely not "crunchy" There is an alternative: GLDA The L form of Tetrasodium glutamate diacetate, or GLDA, is based on renewable materials (fermented sugar), functions across a wider pH range, matches or exceeds EDTA in controlling soap scum and is readily biodegradeable. (It is also being researched for use as a micronutrient) GLDA is sold under the trade names of Dissolvine-GL and BioPure GLDA From the BioPure pdf: Biopure™ GLDA is a 1:1 Replacement for EDTA •GLDA works as well as EDTA, if not better, as seen in testing for Calcium Sequestration Values at a pH of 11 and 27oC. Calcium Sequestration is the process of binding or confining calcium ions to separate them from other components of a biological system. From the Dissolvine-GL website: GLDA is free from genetically modified raw materials and is not irritating to skin or eyes. It is suitable to be used in personal care and cosmetics to chelate calcium and transition metal ions https://chelates.nouryon.com/products/dissolvine/dissolvine-gl/ https://www.jarchem.com/portfolio/biopure-glda/ https://files.constantcontact.com/ca75b1e0701/ee373c36-f92d-44e8-9577-35e3c144a179.pdf http://www.subsport.eu/wp-content/uploads/2012/05/AkzoNobel_Gl_Technical_brochure_tcm108-40030.pdf This was posted as an alternative to EDTA. (For a more natural chelator, Sodium citrate is often suggested, which can be purchased, or made by reacting citric acid with sodium hydroxide, or ... for the adventurous, adding lemon juice, with sufficient NaOH to counter it's acidic action, to your soap ).