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I'd be tempted if I was going to be in town for the end of the auction. Love me some phosphates!

One can find STPP from various online sources if that's all what's wanted.

Indeed have found adding STPP to modern laundry detergents or soaps far better alternative than most vintage products.

Issues with vintage detergents sold in USA is most are high dilution, best suited to top loaders of old with short wash cycles.

https://www.amazon.com/dp/B07PKWSVVX
 
Thank you, Launderess. I have a 10 pound bucket delivered every four months on a subscription plan through Amazon Prime. I keep a container downstairs for laundry and a smaller one upstairs for the dishwashers. I imagine I keep a long section of our street's sewer pipes free from buildup along with my machines. STPP is also essential for a Hot Break as our former member Budd the Laundry Man from Texas told us. If you have textiles with blood or other protein deposits, STPP in hot or warm wash water will remove the protein without setting it, eliminating the need for cold water pre-washing. STPP is also good for encouraging blooms on crepe myrtles that don't seem to have enough phosphate in the soil to really put on a spectacular bloom display. In the spring I dissolve some in hot water and pour it around the plants then stand back.
 
Thank you, Launderess. I have a 10 pound bucket delivered every four months on a subscription plan through Amazon Prime. I keep a container downstairs for laundry and a smaller one upstairs for the dishwashers. I imagine I keep a long section of our street's sewer pipes free from buildup along with my machines. STPP is also essential for a Hot Break as our former member Budd the Laundry Man from Texas told us. If you have textiles with blood or other protein deposits, STPP in hot or warm wash water will remove the protein without setting it, eliminating the need for cold water pre-washing. STPP is also good for encouraging blooms on crepe myrtles that don't seem to have enough phosphate in the soil to really put on a spectacular bloom display. In the spring I dissolve some in hot water and pour it around the plants then stand back.
Several alkaline substances will work as laundry "breaks". Some have been used for ages in commercial/institutional laundries for yonks.

Sodium hydroxide (lye)

Sodium metasilicate

Sodium carbonate

Ammonium hydroxide (when dissolved in water is household ammonia)

Triethanolamine

For quite sometime hospitals or healthcare laundries in UK and elsewhere in Europe dealt with blood marks by using nothing more than soap, sodium metasilicate and perborate bleach in very hot water. If that sounds familiar it should as those three ingredients made up Persil soap of old. PER-Sil, get it? Simply rinse/flush soiled laundry, then off to the races.

Then and still today commercial/industrial laundries rely upon chemicals and pH rather than enzymes for soil/stain removal. This is changing but more at OPL or whatever levels. Enzymes require extensive contact time to give decent results. Commercial laundries generally have total wash cycles of 30 to 40 minutes, that's with a pre-wash/flush, main wash and several rinses. My European washers allot often nearly or over an hour just for rinses and final extraction.

In general have found chemicals or pH will get faster and better results in less time compared to enzymes.

Have some Ecolab stain blaster for pretreating protein soils. Thought stuff contained enzymes, but not a whiff. Instead it's largely surfactants and base chemicals such as triethanolamine. Gets out blood, collar soils and other protein stains with just bit of product applied, waiting five minutes, then wash

 
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