Update: Here is the actual data sheet for the product, it is not biolees.
Nice work putting in the effort to get the TDS. Keller is a German company. Biolees, now Oenolees, is manufactured by Laffort, a French company. Both products are identical in that they’re designed to replace natural yeast lees. If you have healthy yeast lees, and you wish to age your wine sur lie, don’t bother getting involved with these products. Use them if you don’t have healthy yeast lees.
As for dosing and duration, I treat these lees products as I would when I age on my fermentation yeast lees. I’ve let my Chardonnay rest on the lees nearly a year. About six to nine months of stirring, settle, cold stabilize, and rack clear wine off the tartrate crust that forms on top of the lees, then bottle. The determining factor for me for lees contact is desired wine impact and ongoing health of the lees. Any reductive or off aromas and it’s time to rack.
I want to address one point here, and that is lees contact. Most of the info available to home winemakers dictates that racking off the gross lees is critical and any lees aging should be done on the fine lees only. This “catch all” advice works well for the less experienced, but if you have a healthy fermentation, useful lees may be being dumped down the drain.
For example, my 2019 Napa Cab Sauv ferment was very healthy and the wine is still in barrels on the lees. As for my press protocol, wine goes from press to press pan, where the very heavy lees and organic grape matter settle on the bottom of pan, then straight to barrel. This press to barrel process takes about one hour. In this case, I stirred the lees until desired impact, then settled. ML is done and I monitor every six to eight weeks. My protocol does not mandate anything, so in the case of my ‘19 Cab, I have it still resting on the original lees and it has never been racked. Tastes, great, excellent mid-palate volume, low VA, and only barrel ox. The point being, when it comes to these lees products, many are designed to mimic or replace what you may already have access to.
I don’t get on this site often, but do enjoy reading through some of the posts. I hope some of this info helps.