The formulation for alfalfa hay, which is HIGHER in CALCIUM than phosphorous...
Has much higher calcium than phosphorous.
EQUIDAE® Horse Feed - Equidae Alfalfa Plus Horse Feed
The RB made by Buckeye for Alfalfa hay has a phosphorous level of 1.5% (min) and a calcium MAX to be 1.5%, so they are following the rules of the ca/phos ratio.
The equidae coastal, formulated to be fed with grass hays, has a higher phosphorous to calcium ratio...
I think the company needs to sit back and look at other horse feeds so they can provide an apples to apples feed.
Looking at Alfalfa vs. Coastal, it appears to me that Coastal should be fed with Alfalfa hay and Alfalfa fed with Grass hay, but by the names of it, most people won't.
I'm not sold on it even enough to try it on one of my horses at this point.