TA vs pH: Why Alkalinity Matters

The Relationship Between Total Alkalinity and $\text{pH}$While $\text{pH}$ (the measure of acidity or basicity) is the most famous chemical parameter, Total Alkalinity ($\text{TA}$) is arguably the most important for pool stability. $\text{TA}$ measures the concentration of alkaline substances in the water, which act as a buffer for $\text{pH}$. Think of $\text{TA}$ as $\text{pH}$'s bodyguard. If the $\text{TA}$ is balanced (ideally $80$ to $120$ ppm), it prevents the $\text{pH}$ from swinging wildly due to factors like rain, chemicals, or bather load. If $\text{TA}$ is too low, the $\text{pH}$ will be erratic and nearly impossible to control, leading to corrosive water. If $\text{TA}$ is too high, the $\text{pH}$ can become "locked" high (above $7.8$), leading to cloudy water and scale formation. Shipwrecked Pools checks $\text{TA}$ every week and uses Sodium Bicarbonate (to raise) or Muriatic Acid (to lower) to keep it in the sweet spot. This guarantees your $\text{pH}$ remains stable, ensuring optimal chlorine function and preventing damage to your pool’s surfaces and equipment.