I really don't see what's so "new" or "exciting" about this approach. Dr. Bingman was the first to propose this methodology as a way to increase kalkwasser additions to a reeftank over 2 years ago in his Aquarium Frontiers article:
http://www.animalnetwork.com/fish2/aqfm/1999/oct/bio/default.aspMyself, I've been doing this and have had excellent results with it.
Also, I concur with mgk65 and jdeets that no where in that thread did BReefCase advocate pouring the stuff into the sump. He dripped his (quote from his first post in that thread you mentioned):
<BLOCKQUOTE><font size="1" face="Verdana, Helvetica, sans-serif">quote
15 ml is more Vinegar than some people are comfortable with, but I use it constantly with no problems. There should be no sediment in the mixture, or just a little bit at most. You can let the sediment settle out if you don't like the white flakes in your tank. I just drip the liquid and the sediment both into my tank.
If you pour it in you are just looking for trouble IMHO. [img]images/smiles/icon_eek.gif[/img] I do have some reservations about dripping in the powder as well, but that's just me.
Here's my methodology of adding kalkwasser to my tank and I only have to deal with it every 2 weeks now:
http://liquidreef.freeservers.com/ , click on the Equipment link and then scroll down to the "Calcium/Alkalinity supplementation" section. It's under #4 and the link is labeled "DIY Kalkwasser Auto-Topoff System". Works like a charm: Ca=420 ppm, alk = 10 dKH (rock solid since inception 4 months ago).
liquid