Hayward Ec40ac blowing dirty into pool

[davesdog]

We just bought a house in the fall that came with a pool. Everything was winterized, pump and filter drained and brought inside. Everything this season seemed to be OK. We had to add lots of washing soda, and baking soda to get our numbers in line. Now when the pump first kicks in, or when you regenerate this de filter, it blows out dirty looking water for a few moments. The liner is starting to become stained also?
Pool store tested water, copper is .2

Thanks
Dave