This controls the amount of Total Dissolved Solids (TDS) in the boiler water, and is sometimes also referred to as 'continuous blowdown'. The boiler connection is typically DN15 or 20. The system may be manual or automatic. Whatever system is used, the TDS in a sample of boiler water is compared with a set point; if the TDS level is too high, a quantity of boiler water is released to be replaced by feedwater with a much lower TDS level. This has the effect of diluting the water in the boiler, and reducing the TDS level.On a manually controlled TDS system, the boiler water would be sampled every shift.A typical automatic TDS control system is shown in Figure 3.7.6
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