Total Alkalinity is a measure of bi-carbonates, carbonates and hydroxides in the pool and can be tested with a 4 in 1 test kit provided by your builder/installer. The Australian Standard recommends a range of 80-150ppm. Low T.A will lead to. Furthermore, it can raise calcium levels and cause itchiness, burning, and other unwanted side effects. To lower alkalinity in your pool, follow these steps: Test the pool’s alkalinity. Add dry acid or liquid acid. Do a partial drain and refill. Cover the swimming pool. Use lemon juice. Pour rainwater into the pool.