1/3 cup of STPP?

kimmers69February 24, 2011

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?!?

Thank you for reporting this comment. Undo

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

    Bookmark   February 24, 2011 at 1:39PM
Sign Up to comment
More Discussions
Official Cheer HE Powder...Finally
I was so happy to find that P&G now offers Cheer...
Good sheet set, stand up to laundering...
Hi all: I placed this post in the laundry forum because...
Need help choosing a large capacity washer- whats the least bad option
I really want a Miele or a Speed Queen. That said,...
Mysterious Stains on White Clothing LG front load
Hi, I've been searching for the answer to this question...
Favorite detergents again, please.
What are your favorite detergents (specify liquid or...
Sponsored Products
Adesso Lamps Director 62-1/2 in. Black Floor Lamp 6424-01
Home Depot
Quick Ship & Assembled Cabinets: Home Decorators Collection Kitchen Cabinets
Home Decorators Collection
Set of 3 Lighted Cherry Blossom Fiber Optic Flowers
$29.91 | Lamps Plus
Mia Bronze Three-Light Bath Fixture with Ceylon Glass
$445.50 | Bellacor
Virtu MS-2157L-WMSQ-ES-001 57 Espresso Single Square Sink Bath Vanity
Blue Bath
Artichoke Salt and Pepper Shaker Set
The City Farm
Serena & Lily Hanna Andersson Baby Sleeper
Serena & Lily
Princeton Bath Bar
© 2015 Houzz Inc. Houzz® The new way to design your home™