What percentage of STPP should i use in this liquid laundry detergent formula if water is very hard?

What percentage of STPP should i use in this liquid laundry detergent formula if water is very hard?


SLS in powder form 3.4% active
Alkyl polyglycosides 2.5% active 
CMC 0.2% 
Water
pH 10-11

Comments

  • chemicalmattchemicalmatt Member, Professional Chemist
    I'd add 2.0% or so. It will bump up your pH to 12 or so, but also factor into detergency too. 
  • I'd add 2.0% or so. It will bump up your pH to 12 or so, but also factor into detergency too. 
    Thanks 
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