Does beech sap foul membranes permanently

[Mean_Oscar]

On the Facebook black walnut page, a fellow fairly new to RO said beech sap clogged the membranes so badly they had to be discarded. Quote from post:

"I was also experimenting with beech this year (10 trees under vacuum collection) because I've got TONS of beeches, so I bought an RO right off the bat. Which is good because my beech sap was a disappointing 0.2. Also if you think BW pectin is a pain, it can't touch beech. The RO handled the BW sap no problem, but the beech sap actually killed the membranes (expensive mistake). "

The manufacturer graciously went "halvsies" on replacement membranes.

This is especially surprising considering the low (0.2%) concentration. I RO'd bw first time this year with no issues. Anybody else ever see beech do this?

Sorghum demos 25 years
Sorghum and sugar cane syrups
Maple syrup demos 20 years
Maple, boxelder, black walnut, white walnut, black birch & sycamore
2 RO devices and a freezer for f-t
Developing low pressure cooker