Yes, other shower heads would work with Pelican Shower Filter as long as the shower pipe size is 1/2".
However, it is best for you to use the Pelican dual-flow shower head because it is especially designed to optimize the benefits and shelf life of your filter. Other shower head brands could have a higher flow rate, greater than 2.5 gallons per minute and this would reduce the life of your filter as well as its effectiveness.
*Please keep in mind that shower heads with cut-off valves may damage the filter and void your warranty.