On average, you should drain and refill your pool with fresh water approximately every 5 years. Did you know that when water evaporates from your pool, the total dissolved solids (TDS) levels in your pool increase? This build-up will eventually cause the chemicals in your pool to not work as efficiently. The experts at American Pool Service can test your pool water and pinpoint when your pool water will need to be refreshed. American Pool Service can drain and refill your pool and add the necessary chemicals to get your pool operating at peak efficiency.