Ice quality can be affected by many parameters. If you want good quality ice, you should not expose it to large temperature differences. If you want to raise or lower the temperature, do it in stages so the ice has time to get used to the new temperature.
With the REALice specially-designed nozzle, water gets sprayed on the ice in a fine mist so it freezes nearly as quickly as it hits the ice. By using this technique, you are laminating the ice — in thin layers.
When resurfacing the ice, bear in mind that you pass through certain areas more often then others. Lower or stop the water flow when passing through these areas. This will help prevent the ice from getting uneven.