WLP675 is the bacteria type... Here's some information off their website.
Inoculations larger than 59 gallons: To inoculate larger volumes, we recommend inoculating with a larger culture.
Optimal pH: The optimal pH is approximately 4.0, but WLP675 will handle a pH of 3.3 in red wines and...
So, I started the malolactic fermentation(added bacteria) mid to late October, and unfortunately I didn't get a test kit until recently. The reading I got seemed to be a little less than 160, but definitely more than 75. I would have expected it to be much lower?? My pH is right around 3.10-3.12...