By default, miners who connect to Slush Pool while mining with Braiins OS+ will not pay any pool fees. 

If you choose to mine with Slush Pool while using Braiins OS+, you’ll receive a full rebate on the pool fee collected. You will still be able to see the standard pool fee amount that would be collected, but all rebates are automatically paid on a per-block basis. In other words, the pool fee rebate amount will be available to you at the same time as the rest of your mining rewards after we mine a block.