Circulating water spray humidifiers (air washers) experience thickening of the circulating water due to water evaporation and dirt particle washout. This concentration of foreign substances needs to be periodically counterbalanced by blowdown devices to prevent malfunction and excessive contamination. Manual blowdown is therefore part of every LAVAIR air washer.
The desludged water flow is either set manually via a ball valve – manual blowdown – or controlled via a motor-driven ball valve in line with the measured conductivity – automatic blowdown. The advantage of the automated mode is that it provides blowdown rate as needed. Fluctuations in humidifier capacity and contaminant input are reliably levelled out, thereby maintaining consistent water quality.