I was just perusing the Recommended Chemicals entry, and noticed the Borates section has a dead link:
Specifically, AAA-Chemicals.com is now AAA-Chem.com instead. Not sure if they carry boric acid, as it’s listed but requests you contact them about it.
As others have noted, this might be the link of choice for boric acid: (The Chemistry Store is ok too, but their shipping to my location is 3x Duda’s shipping rate.)
Recommended Pool Chemicals
Which should I buy? TFP's recommended pool chemicals are cheap, easy, and won't unbalance your pool water.
www.troublefreepool.com
Specifically, AAA-Chemicals.com is now AAA-Chem.com instead. Not sure if they carry boric acid, as it’s listed but requests you contact them about it.
As others have noted, this might be the link of choice for boric acid: (The Chemistry Store is ok too, but their shipping to my location is 3x Duda’s shipping rate.)