You could attach the Sunflower to the Wellness shower filter however it wont remove anymore from your water than using it by itself. You can't attach two filters to one other to make them more effective when they remove the same thing. You would ruin the added benefit of the added minerals that the Wellness adds back to your water by using the Sunflower shower head because it will just filter them out again.

Removes over 98% of Chlorine and removes about 50% of chloramines.