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1/3 cup of STPP?

Posted by kimmers69 (My Page) on
Thu, Feb 24, 11 at 2:40

I got my first order of STTP yesterday. I am using it in a TL and according to our water district's website, the hardness of our water is 300 parts per million (ppm) or 17.5 grains per gallon, categorized as "very hard."

Following the advice I found in a previous STTP thread, I added 1 TBSP at a time, agitated and then felt the water. The water did not being to feel slippery until I added 5 TBSP!

Can that be right?!?

Follow-Up Postings:

RE: 1/3 cup of STPP?

Assuming your also adding your normal level of detergent first.... I would say yes 1/3 of a cup should work fine with your hard water. Some people on this forum use STPP 1:1 and others 1:2 some use even less. It all dependent on many factors:
what type of soap/detergent your using
Soil load
Washing time
Water quality
Machine type
Suds level
Desired outcome

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