Croatia Water Hardness — Pentair Research
Source attribution: Ronny Billemon, WQA Master Water Specialist (Pentair), Water Management Support — Croatia Coffee Market, V03/2025, supplied directly in the user’s Pentair correspondence. The presentation provides a visual, broad geographic TOTAL hardness map: 0–12, 13–18 and >19 °dH. It does not contain verified city-by-city hotel readings. The figures below are synthetic scenarios, not extracted location measurements.
Croatian regional estimation basis
| Region | Example total hardness | Assumed carbonate hardness | Reason | Examples |
|---|---|---|---|---|
| Istria | 15.5 °dH | 10.9 °dKH | Pentair V03/2025 regional map; Pula is a harder exception | View Claris cases |
| Kvarner | 15.5 °dH | 10.9 °dKH | Pentair V03/2025 coastal regional map; no site-specific test | View Claris cases |
| Other Croatia | 15.5 °dH | 10.9 °dKH | Pentair V03/2025 broad geographic zones; site differs | View Claris cases |
Reference cartridge capacity (Pentair @ 10 °dKH)
| Pentair Claris Ultra | Nominal 10 °dKH | Product code |
|---|---|---|
| Claris Ultra 250 | 2250 L | 4339-80 |
| Claris Ultra 500 | 3750 L | 4339-81 |
| Claris Ultra 1000 | 7000 L | 4339-82 |
| Claris Ultra 1500 | 10000 L | 4339-83 |
| Claris Ultra 2000 | 16500 L | 4339-84 |
Critical interpretation
| Parameter | Rule |
|---|---|
| Total hardness °dH | Map’s geographic category; not a carbonate hardness measurement |
| Carbonate hardness °dKH | Explicitly assumed for the demonstration; a site titration is mandatory before real sizing |
| Bypass setting | Not known at any demo site; must be confirmed on installation |
| Metered volume | Not present; synthetic estimate only |
| Replacement time | Volume capacity OR no later than the manufacturer-recommended service interval |
| Source confidentiality | Pentair document is user-supplied; this site cites principles, not republishes the original PDF |