These recipes make use of 3 polymers: PEO, HPMC and CMC. They were inspired by reports from Doc Groebel on SBF, the Soap Bubble Fanciers Yahoo Group that suggest that HPMC and CMC together have a synergy and improve a mix when used together in a way that they do not on their own. PHC mixes seem superior to PEO/HPMC or PEO/CMC mixes. It has been hard to make a definitive determination as to whether the mixes are superior to PEO-only mixes. It may be largely an issue of personal preference.