Hiya Terry and
to Purrs
My Misty started getting Bother with Knots when He started His Fortekor medicine, He didn't mind getting groomed before
but when there are knots and tangles involved, it was a different matter
as Janeyk suggest's the best way of dealing with these hard lumps of Fur, is to Gently Tease them & pull them out with your Fingers
" some will require a bit of strength when pulling, just got to be careful it's only hair and not skin aswell "
when you get to the stage that there is a loose lump, thats when to get the slicker out
Olivia had a few when I first got Her, but if you get them out and keep on top of it ( i.e. regular grooming ) that should keep them at bay
hth