u/Birdman_2099

I have been brewing cold brew for a few years now. I typically purchase local freshly roasted beans. I then use a Baratza Encore ESP on the most course setting to grind, or near to it (37-40). I recently started using flower sifters to remove additional fines.
On this last batch, I ground 24 oz of beans (net 22 oz grounds) and placed them in hemp nut milk bags. I brewed with a 9:1 ready to drink ratio. I still had to filter everything through seven paper filters. The coffee is still relatively cloudy. What could I possibly be doing wrong?

Background:
I have 3,000 sq ft. Marathon 2 (“M2”) Located in Riverside County (Zone 10 A). Grass is < 1 year old. Late winter early spring I began to find seed heads on thick stemmed grass sprouting above my M2.

Problem:
It was everywhere… clumping. I don’t see rhizomes. Just short rooted thick bladed, hard stemmed, grass, some with clasping auricles.

Research:
I continue to see a variety of answers from my research, local nurseries / supply houses, and even AI: Dallisgrass, KBG, Annual Ryegrass, Poa Annua, Perennial, etc.

Marathon 2 is a turf-type grass, “dwarf tall fescue,” funny I know, but I cannot seem to find a way to rid it. I crawl the lawn and de-root seed heads before mowing (mulch, not bagged), and have laid spread Dimension (turf, and ornamental herbicide) “pre-emergent” in case I don’t get all the seed heads by hand.

Photos:
First 5 are of a the clumping, thick/hard stem grass.
Last two are of the same variety, but with seed heads (dried from a few days ago).

I’d rather not spend 4-5 days derooting hundreds of clumps by hand, just to receded, or sod over, the cleaned areas.

Need help identifying, and determining what post emergence might work.

Thanks in advance.