To repair a Delta shower head, unscrew the shower head from the arm, and remove the filter. Rinse the filter and the shower head with clean water, and then soak them in one part water to one part vinegar solution for several hours. Replace the filter, and reinstall the shower head on the arm. The procedure and techniques for repairing a Delta shower head may vary with the model, but the underlying principles are similar.
Before resorting to repairing the shower head, ascertain that the problem is not coming from another part, such as the arm. After removing the head, turn on water, and allow it to run for 30 to 40 seconds to flush the arm.
The different models of Delta shower heads have various features, but the same ideas for repairing apply in most cases. The debris screen on the head acts as a filter for solid particles, and a buildup of the particles hampers the flow of water. Use an old toothbrush and running water if rinsing alone is not effective.
Vinegar is acidic, and it reacts with basic hard water deposits such as calcium compounds, removing them from the shower head or filter. For the best results, mix vinegar with warm water. After reinstalling the shower head, turn on both the hot and cold handles, and let the water flush through the shower head for two to three minutes.