Slightly acidic electrolyzed water significantly restrains the accumulation of the microalgae Pseudokirchneriella subcapitata in hydroponic systems.

This article investigates the effects of slightly acidic electrolyzed water (SAEW) on the growth and cellular physiology of the microalga Pseudokirchneriella subcapitata in hydroponic systems. The study found that high concentrations of SAEW (30–40 mg L⁻¹ available chlorine concentration) significantly inhibited algal growth by inducing intracellular reactive oxygen species (ROS) accumulation, leading to oxidative stress, lipid peroxidation, and loss of cell membrane integrity. Conversely, low concentrations (10–20 mg L⁻¹) slightly promoted algal growth and antioxidant enzyme activities. Importantly, SAEW treatments at these concentrations did not adversely affect tomato seedling germination or growth, suggesting its potential as a safe and effective method to control algal proliferation in hydroponic pipelines and tanks without harming crops. The findings support SAEW’s application for improving hydroponic environments and advancing sustainable agricultural practices.