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| Inch | mm | 
| 5/32 | 3,96 | 
| 3/16 | 4,76 | 
| 1/4 | 6,35 | 
| 5/16 | 8 | 
| 3/8 | 9,52 | 
| 1/2 | 12,6 | 
| 5/8 | 15,87 | 
| 7/8 | 22,22 | 
| Inch | Diametru exterior mm | Diametru interior mm | 
| G1/8″ | 9,7 | 8,8 | 
| G1/4″ | 13,1 | 11,8 | 
| G3/8″ | 16,6 | 15,3 | 
| G1/2″ | 20,9 | 19,17 | 
| G5/8″ | 22,9 | 21,1 | 
| G3/4″ | 26,4 | 24,6 | 
| G7/8″ | 30,2 | 28,4 | 
| G1″ | 33,2 | 30,9 | 
| GPD | L/zi | 
| 50 | 189,27 | 
| 75 | 283,91 | 
| 100 | 378,54 | 
| 150 | 567,81 | 
| 200 | 757,08 | 
| 300 | 1135,62 | 
| 400 | 1514,16 | 
| 500 | 1892,71 | 
| 600 | 2271,25 | 
| 800 | 3028,33 | 
| 1000 | 3785,41 | 
| 2400 | 9080 | 
| 2600 | 9850 | 
| 10500 | 39690 | 
| Bar | Psi | 
| 1 | 14,5 | 
| ppm | µS/cm | mg/l | 
| 1 | 2 | 1 | 
| Micron [µ] | Milimetri [mm] | 
| 1 | 0.001 mm | 
| 1 mmol/L | 1 ppm, mg/L | 1 dGH, °dH | 1 gpg | 1 °e, °Clark | 1 °fH | |
|---|---|---|---|---|---|---|
| mmol/L | 1 | 0.009991 | 0.1783 | 0.171 | 0.1424 | 0.09991 | 
| ppm, mg/L | 100.1 | 1 | 17.85 | 17.12 | 14.25 | 10 | 
| dGH, °dH | 5.608 | 0.05603 | 1 | 0.9591 | 0.7986 | 0.5603 | 
| gpg | 5.847 | 0.05842 | 1.043 | 1 | 0.8327 | 0.5842 | 
| °e, °Clark | 7.022 | 0.07016 | 1.252 | 1.201 | 1 | 0.7016 | 
| °fH | 10.01 | 0.1 | 1.785 | 1.712 | 1.425 | 1 | 
| Clasificare | duritate in mg-CaCO3/L | duritate inmmol/L | duritate in dGH/°dH | duritate in gpg | duritate in ppm | 
|---|---|---|---|---|---|
| Foarte Moale | 0–60 | 0–0.60 | 0–3.37 | 0–3.50 | 0–60 | 
| Moale | 61–120 | 0.61–1.20 | 3.38–6.74 | 3.56–7.01 | 61–120 | 
| Medie | 121–180 | 1.21–1.80 | 6.75–10.11 | 7.06–10.51 | 121–180 | 
| Dura | 214-320 | 3.14-3.2 | 12-18 | 12.48-18.72 | 214-320 | 
| Foarte dura | 534 | 5.34 | ≥30 | 31.2 | 534 |