Whether your chosen shower head is round or square will rarely have an impact on the water pressure you can expect. However, most low water pressure types, such as ceiling showers or wall panels, will tend to feature an angular or square design. This is usually because a square shower will complement the modern aesthetic that most mounted showers will aim for. If you are after low water pressure, be sure to check out eco-friendly showers or adjustable designs, as they will tend to offer the best selection of low-flow spray patterns.