After ready rave review of the oxygenic shower head I ordered one off of amazon. Husband went to hook it up this weekend but seems like it has less pressure than the factory shower head. He used the existing hose off the old shower. Wondering what may have gone wrong with the set-up? I did not see it myself so thinking i will try again to install it on my own. Husband can be stubborn to think that maybe he did something wrong. Any tips on the install?