Why your geyser heats slowly in Sihor
At 520 ppm, your geyser element accumulates scale gradually. By the 18-month mark without maintenance, heat transfer efficiency drops measurably. The rumbling sound you might hear when it heats is scale fracturing under thermal stress - that is your cue to descale.
Geyser descaling every every 3 months is appropriate for 520 ppm. For a storage geyser: drain the tank, introduce an acid descaling solution, allow 3-4 hours, flush with 3 full tank volumes.
