Will an alka seltzer tablet harm a septic system?

Alka-Seltzer tablets are generally not harmful to a septic system in small quantities, as they dissolve quickly and are primarily composed of sodium bicarbonate and citric acid. However, frequent use or large quantities may introduce excess sodium and other chemicals that could disrupt the balance of bacteria essential for breaking down waste in the septic tank. It's best to limit the use of any non-biodegradable products to maintain the health of the system. Always consult a septic professional if you have concerns.