Here's a little blurb from an article on bentonite use, from the WineMakers Academy:
"Use As Little As You Can
Besides the tartrate instability that can come from using too much bentonite there is another reason you’ll want to use this stuff sparingly. Bentonite is a “fining” agent which means that it removes various compounds from your wine. It can reduce or remove aromas, flavors, as well as color.
Sometimes it is necessary to remove off flavors and aromas, however, you don’t want to sacrifice varietal character. While your wine will be clear, it will be missing what made it special to begin with.
How Does Bentonite Work
This will get a little nerdy but it’s worth understanding. When hydrated in water the minerals in bentonite become negatively charged (i.e. ions).
The negative ions in the clay bond with positively charged particles floating around in your wine causing haziness. Generally wines are cloudy because the floating particles are all similarly charged (all positive or all negative).
Similarly charged particles don’t settle out because they resist each other like magnets of the same polarity. They need something with an opposite charge to bond with them so they’ll be neutral.
Because bentonite is negatively charged and dense when it does bond with a positively charged particle they both sink to the bottom of your carboy. Once on the bottom you can rack your clear wine off of the sediment.
Some kit manufacturers (such as Winexpert) have you add bentonite in the very beginning of the wine making process, right before the yeast. That is so the bentonite will start clarifying the wine as it’s fermented. This is one of the only clarifiers that can be added pre-fermentation.
It sits on the bottom of the fermenter and as carbon dioxide bubbles form during fermentation the bentonite is carried up to the free surface. Along the way it collects positively charged particles. When the bubble reaches the surface and pops the bentonite falls back down to the bottom collecting more particles along the way.
Thus your wine is clarifying during the entire fermentation process. This makes your wine will clear that much more quickly when you add the final clarifier just before bottling.
In Conclusion
Bentonite is an effective clarifier widely used among wine makers. As a clay it is not very reactive when it is dry or when hydrated so you don’t have to worry about skin contact.
Remember that it’s possible to use too much of it and strip your wine of its varietal characteristics. Also, store your bentonite in airtight dry containers between uses to prevent micro-organisms from taking up residence."
And a shorter passage on chitosan from Winemaker Magazine:
"Chitosan (positive charge): As the name implies, it is composed of chitin, which is the structural element of the exoskeletons of crustaceans, such as crabs, shrimp and other shell fish. Chitosan is especially popular in clearing white wines, since it does not require the aid of tannins to clear, as do some fining agents like gelatine. When used with negatively-charged Kieselsol it is an effective remover of most suspended proteins and solids.
Chitosan and Kieselsol are often sold as a set, in sealed liquid envelopes as fining A (negatively charged Kieselsol) which is added to the wine first, and then fining B (positively charged chitosan) added about a day afterwards. Chitosan has a reputation for being fairly gentle on the character of finished wine. "
So in this kit, the WE plan is to use bentonite to handle negatively charged particles, chitosan for the positively charged particles. I'm sure the quantities they've provided will get it done pretty expediently. Kieselsol and chitosan would probably also work as a combo. Again, I'm going to let Mother Nature help me along and avoid the risk of stripping anything out of the wine.