Where to get sodium carbonate (washing soda) in S.F. Bay Area

After looking high and low, finally found it at a place I shop at all the time.
If a guy around here wanted some washing soda, he'd want to go to Orchard (OSH). Look in the pool chemical section for something called "pH Plus" by Kem-Tek.
The only other place I found locally that has this is a pool supply place up in Richmond that wanted about $12 for 5 lbs; at OSH, it's $7.50.
Pure sodium carbonate according to the list of ingrediments.
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RE: David Nebenzahl wrote:

Which Hydrate? Likely the deca. Dan
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Washing soda from the grocery store is monohydrate.
The decahydrate and anhydrate forms turn to monohydrate if left in open air.
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On Tue, 02 Jan 2007 16:33:44 -0800, David Nebenzahl

I buy "light soda ash" in 50-pound sacks for about $14. This is a lot of washing soda; one bag lasts about 6-8 years. Look under cleaning supplies in the yellow pages. It's also known as "sal soda" or just plain "soda." I use it to make laundry soap or as a laundry booster.
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Phisherman spake thus:

Where do you get it? All the cleaning places I called (several) were clueless. Most turned out to be Chinese suppliers of Chinese laundries who didn't even speak English ...
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On Tue, 02 Jan 2007 20:54:27 -0800, David Nebenzahl

I buy it at a chemical supply warehouse. Most chemicals are sold to janitorial businesses or soap factories. You may need to learn a few Chinese words, especially the word(s) for "soda ash." You might be able to order it online, although shipping costs would be high.
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