DUKE T drop tester for water hardness

The DUKE T drop tester is used to determine the hardness of water in a hot tub and pool, with approximately 100 measurements (the actual number depends on the magnitude of the value). Measuring hardness is important for proper water maintenance – high hardness reduces the effectiveness of pool chemistry and leads to limescale deposits on the walls and to scaling of the circulation circuit pipes.

Hardness determination

• Method: drop-by-drop titration in 1°N steps
• Reagents: T1 (120 determinations), T2 (120 determinations), T3 (600 drops)

Indicative values

The hardness of surface and ground water usually ranges from 2-30°N, in places up to 50°N. Water up to 8°N is soft, up to 25°N hard and above 25°N very hard. For pools, the range 11-20°N (2-3.5 mmol/l) can be considered optimal. The tester is supplied in a plastic blister with reagents, cups, instructions and technical information.

Technical parameters

• Number of determinations: approx. 100
• Titration step: 1°N
• Manufacturer: DUKE JABLONEC s.r.o.