Ph testing RO is not reliable. And I agree it need to be buffered if the nutrients do not provide this
PPM reading of my tap water
- Thread starter Vitov7
- Start date
Kushash
Well-Known Member
Looking at my water report the calcium is 73 ppms and magnesium is 23 ppms and I usually cut it with 1 part tap / 2 parts RO.
The list of shit in my water includes most if not all of the well known micro nutrients used for growing.
Total dissolved reads 569 ppms.
It changes from that to sometimes being in the low 400's depending on the time of year.
I'm guessing sometimes they take water from the aquifer lowering the ppms.
Las Vegas Valley Water District
Las Vegas Valley Water District 2019 Water Quality Summary
The list of shit in my water includes most if not all of the well known micro nutrients used for growing.
Total dissolved reads 569 ppms.
It changes from that to sometimes being in the low 400's depending on the time of year.
I'm guessing sometimes they take water from the aquifer lowering the ppms.
Las Vegas Valley Water District
Las Vegas Valley Water District 2019 Water Quality Summary
| Substance | Average Value | MCL | Units |
|---|---|---|---|
| ALKALINITY | 140 | N/A | ppm |
| ALPHA EMITTERS | <3 | 15 | pCi/L |
| ALUMINUM | <5 | 200 | ppb (1) |
| ANTIMONY | <0.4 | 6 | ppb |
| ARSENIC | 2 | 10 | ppb |
| BARIUM | 0.1 | 2 | ppm |
| BERYLLIUM | <0.4 | 4 | ppb |
| BROMATE | 5 | 10 | ppb |
| BROMIDE | <0.20 | N/A | ppm |
| CADMIUM | <0.5 | 5 | ppb |
| CALCIUM | 73 | N/A | ppm |
| CHLORIDE | 88 | 400 | ppm (1) |
| CHLORINE RESIDUAL | 0.9 | 4.0 (2) | ppm |
| CHROMIUM, TOTAL | <3 | 100 | ppb |
| COLIFORM, TOTAL | 0.1% | 5% | percent positive per month |
| COLOR, TRUE | <1 | 15 | PCU (1) |
| CONDUCTIVITY | 941 | N/A | µS/cm |
| COPPER | 0.004 | 1.0 | ppm (1) |
| CYANIDE, FREE | <25 | 200 | ppb |
| FLUORIDE (3) | 0.7 | 4.0 2.0 | ppm ppm (1) |
| HALOACETIC ACIDS (Total Regulated) | 36 | 60 | ppb |
| HARDNESS, TOTAL | 280 16.4 | N/A | ppm gpg |
| IRON | <50 | 600 | ppb (1) |
| LEAD | <0.3 | N/A | ppb |
| MAGNESIUM | 23 | 150 | ppm (1) |
| MANGANESE | <5 | 100 | ppb (1) |
| MBAS | <0.1 | 0.5 | ppm (1) |
| MERCURY | <0.2 | 2 | ppb |
| MOLYBDENUM | <5 | N/A | ppb |
| NICKEL | <5 | N/A | ppb |
| NITRATE (as NITROGEN) | 0.4 | 10 | ppm |
| NITRITE (as NITROGEN) | <0.02 | 1 | ppm |
| ODOR | <1 | 3 | TON (1) |
| ORTHO PHOSPHATE | 27 | N/A | ppb |
| PERCHLORATE | 0.6 | N/A | ppb |
| pH | 7.9 | 6.5 - 8.5 | pH units (1) |
| POTASSIUM | 4.4 | N/A | ppm |
| RADIUM 226 AND RADIUM 228 (Combined) | <1 | 5 | pCi/L |
| SATURATION INDEX | 0.4 | N/A | N/A |
| SELENIUM | 2 | 50 | ppb |
| SILICA | 8.5 | N/A | ppm |
| SILVER | <5 | 100 | ppb (1) |
| SODIUM | 83 | N/A | ppm (4) |
| SULFATE | 209 | 500 | ppm (1) |
| TEMPERATURE | 17.5 | N/A | deg C |
| THALLIUM | <0.2 | 2 | ppb |
| TOTAL DISSOLVED SOLIDS | 569 | 1000 | ppm (1) |
| TRIHALOMETHANES (Total) | 67 | 80 | ppb |
| TURBIDITY | 0.08 | N/A | NTU (4) |
| URANIUM | 4 | 30 | ppb |
| VANADIUM | <5 | N/A | ppb |
| ZINC | 0.1 | 5.0 | ppm (1) |
| Substance | Average Value | MCL | Units |
|---|---|---|---|
| 1,2,4-TRICHLOROBENZENE | <0.5 | 70 | ppb |
| 1,1,1-TRICHLOROETHANE | <0.5 | 200 | ppb |
| 1,1,2-TRICHLOROETHANE | <0.5 | 5 | ppb |
| 1,1-DICHLOROETHYLENE | <0.5 | 7 | ppb |
| 1,2 DICHLOROPROPANE | <0.5 | 5 | ppb |
| 1,2 -DICHLOROBENZENE | <0.5 | 600 | ppb |
| 1,2-DICHLOROETHANE | <0.5 | 5 | ppb |
| 1,4 -DICHLOROBENZENE | <0.5 | 75 | ppb |
| 2,3,7,8-TCDD (DIOXIN) | <0.005 | 0.03 | ppt |
| 2,4-D | <0.1 | 70 | ppb |
| ALACHLOR | <0.1 | 2 | ppb |
| ATRAZINE | <0.05 | 3 | ppb |
| BENZENE | <0.5 | 5 | ppb |
| CARBOFURAN | <0.5 | 40 | ppb |
| CARBON TETRACHLORIDE | <0.5 | 5 | ppb |
| CHLORDANE | <0.1 | 2 | ppb |
| CHLOROBENZENE | <0.5 | 100 | ppb |
| cis-1,2-DICHLOROETHYLENE | <0.5 | 70 | ppb |
| DALAPON | <1 | 200 | ppb |
| DI (2-ETHYLHEXYL) ADIPATE | <0.6 | 400 | ppb |
| DI (2-ETHYLHEXYL) PHTHALATE | <0.6 | 6 | ppb |
| DIBROMOCHLOROPROPANE | <0.01 | 0.2 | ppb |
| DICHLOROMETHANE | <0.5 | 5 | ppb |
| DINOSEB | <0.2 | 7 | ppb |
| DIQUAT | <0.4 | 20 | ppb |
| ENDOTHALL | <8 | 100 | ppb |
| ENDRIN | <0.01 | 2 | ppb |
| ETHYLBENZENE | <0.5 | 700 | ppb |
| ETHYLENE DIBROMIDE | <0.01 | 0.05 | ppb |
| GLYPHOSATE | <6 | 700 | ppb |
| HEPTACHLOR EPOXIDE | <0.01 | 0.2 | ppb |
| HEPTACHLOR (H-34, HEPTOX) | <0.01 | 0.4 | ppb |
| HEXACHLOROBENZENE | <0.05 | 1 | ppb |
| HEXACHLOROCYCLOPENTADIENE | <0.05 | 50 | ppb |
| LINDANE | <0.01 | 0.2 | ppb |
| METHOXYCHLOR | <0.05 | 40 | ppb |
| MTBE | <0.5 | N/A | ppb |
| OXAMYL (VYDATE) | <0.5 | 200 | ppb |
| PAHs (benzo(a)pyrene) | <0.02 | 0.2 | ppb |
| PENTACHLOROPHENOL | <0.04 | 1 | ppb |
| PICLORAM | <0.1 | 500 | ppb |
| POLYCHLORINATED BIPHENYLS | <0.1 | 0.5 | ppb |
| SILVEX (2,4,5 - TP) | <0.2 | 50 | ppb |
| SIMAZINE | <0.05 | 4 | ppb |
| STYRENE | <0.5 | 100 | ppb |
| TETRACHLOROETHYLENE | <0.5 | 5 | ppb |
| TOLUENE | <0.5 | 1000 | ppb |
| TOXAPHENE | <0.5 | 3 | ppb |
| trans-1,2 DICHLOROETHYLENE | <0.5 | 100 | ppb |
| TRICHLOROETHYLENE | <0.5 | 5 | ppb |
| VINYL CHLORIDE | <0.5 | 2 | ppb |
| XYLENES | <0.5 | 10,000 | ppb |
Yeah I would definitely cut that with RO at least 50/50 maybe even more 75/25
Kushash
Well-Known Member
In the past I would cut it to 150 ppms on a 500 scale and this grow I'm cutting it closer to 200ppms sometimes. Still ends up closer to 3 parts RO.