Dishwashing liquid

After 2 weeks , fine floaters appeared then some big after after 


  • I think that may be microbial growth. You’re lacking a strong preservative. Sodium triophosphate (from doing a quick search) seems to be a food preservative for things that are normally kept refrigerated (meat, poultry, fish).

    You’ll want to add some phenoxyethanol (or another preservative to have full protection), potassium sorbate to complement your sodium benzoate and a chelator (EDTA). However, alkaline (to my understanding) is better for grease removal power. So that renders sodium benzoate and potassium sorbate useless as your preservatives, which need a pH of 3-4 to be active.

    You could probably just use Phenonip for this. And still add the chelator. 
  • ozgirlozgirl Member, PCF student
    I agree with Letsalcido that it is most likely microbial growth. Does it have a bad odour?

    Benzalkonium Chloride is not compatible with anionic surfactants like SLES and sodium benzoate is not active at slightly alkaline pH like is used in most dishwashing liquids.

    What is the pH of your product?
  • PerryPerry Administrator, Professional Chemist
    I agree, microbial growth. There's a reason the industry has used parabens and formaldehyde donors for decades.  They work when other things don't.
  • @ozgirl good catch, I missed the benzalkonium chloride in there.
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