kby
Full Member
Posts: 162
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Post by kby on Apr 3, 2008 6:41:49 GMT
I should convert that.... The county water readings were <=0.76 ppm last quarter. Something doesn't sound right. I don't think typical single-glass-distilled water is that good, let alone something run through metal pipes. There's probably a decimal point off or a wrong unit somewhere.-kby
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Post by snowflakeobsidian on Apr 4, 2008 0:12:08 GMT
Here's the most current county info; www.dpwc.org/pdf/Comm%20Bench%20Sheets/cbs%202008.pdf I don't have a TDS meter and cannot say what the readings are for the water coming out of our pipes. There is another factor involved in how the plants look. The Drosera got sprayed for aphids with Ortho Rose Pride (same active ingredient as Orthene though at a lower dosage). The Ping Primulaflora got watered with Bayer Tree and Shrub Insect Control (active ingredient Imidacloprid) for the same reason. The plants were treated at different times which is in part why they got different insecticides.
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Post by rsivertsen on Apr 4, 2008 0:31:55 GMT
Don't underestimate the toxic effect of copper ions in your water with regard to your plants; these things are not usually reported in general water tests because they're generally harmless to humans and pets, but are extremely toxic to plants! - Rich
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Post by ICPS-bob on Apr 4, 2008 0:36:37 GMT
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sundewman
Full Member
Happy Growing!
Posts: 235
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Post by sundewman on Apr 12, 2008 1:43:49 GMT
Evidently, the copper levels for our city water range from .152-.223 ppm. I know copper is very dangerous for plants, but what # ppm is actually considered a harmful range? I'd love to use tap water to save $, but don't know if this is too large an amount. Thanks, Aaron
*Edit---forgot to mention that they detected 72 ppm for Sodium alone. This seems very high when mostly everything else is lower than 1 ppm. How dangerous is Sodium for plants?*
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Post by matt101905 on Jul 13, 2008 23:32:59 GMT
If you only got a few plants, why don't you just go buy distilled water from walmart for 76cents a gallon. (well at least here anyways) You can buy bare-bone RO systems for like $100.
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royal
Full Member
Posts: 8
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Post by royal on Feb 19, 2009 20:03:03 GMT
The secondary (not regulated) limit for Cu in Texas is 1.0 mg/l. The action level is 1.3. The comment about the sample site vs. your tap is a good one. If your water is corrosive at all, and travels through copper pipes, it could easily have waaaay more than what's listed in the water quality report.
Can anyone give me some ranges for TDS and/or levels of constituents that might affect CP's? What's level is safe, what level is borderline, and what's too high altogether?
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Post by Aidan on Feb 19, 2009 21:48:24 GMT
A TDS reading of 50ppm or lower is usually considered to be the ideal. Sometimes 100ppm is quoted and that is probably a good figure to consider as a maximum.
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royal
Full Member
Posts: 8
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Post by royal on Feb 19, 2009 22:47:07 GMT
Thanks Aidan, exactly what I was looking for. So I gather TDS is the most important measurement to consider? What's the next best indicator of water quality for CP's?
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Post by Brian Barnes on Feb 19, 2009 23:38:28 GMT
Royal,
A TDS meter truly is hard to beat as far as an indicator for water quality. You can get one on Ebay for around twenty bucks...
Otherwise, poor growth and death of your plants are the main indicators of bad water.
Happy Growing,
Brian.
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royal
Full Member
Posts: 8
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Post by royal on Feb 23, 2009 14:37:24 GMT
Thanks Brian, But I kind of meant another chemical analysis indicator, or the 2nd most important constituent to consider after TDS. Or a better way to phrase my question might be: What are some of the common water contaminants that affect the growth of most CP's?
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Post by reaper on Aug 6, 2009 12:22:14 GMT
i wonder how you can calculate the total ppm for the water when you have all the concentrations of all the ingredients, except for that total... I was wondering if i could water my plants with my tap water and found this report: www.passagehub.nl/clients/bw/bw_reinwater.nsf/4c1b1a9ac0028e9dc1256a2b0050333b/a6a33c06ad5762bcc12575860000d1fb/Kwaliteitsgegevens/13.4510!OpenElement&FieldElemFormat=gif since its in dutch i'll translate the collumns: Wettelijke norm = legally allowed minimum and maximum Aantal metingen = numer of times tested Waarnemingen = results Gemiddeld = average i see around 23 mg/l Cl and Na, 57 mg/l Ca and less than 0,01 mg/l Cu. neutral ph, and soft water (around 8 DH, but last time i checked that myself it was closer to 5)
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Post by jesser on Aug 6, 2009 22:29:31 GMT
i wonder how you can calculate the total ppm for the water when you have all the concentrations of all the ingredients, except for that total... As a rule of thumb you can use the electrical conductivity to make a fairly good guess for the TDS conversion. A conductivity of 100 µS/cm is typically equal to 50 ... 64 ppm. This is the maximum conductivity of water I would use for carnivorous plants (except Pinguicula) in the long run. So I calculate your water: EGV 36,6 mS/m = 36600 µS / 100 cm = 366 µS/cm Therefore TDS of your tap water should be roughly about 183 ... 234 ppm.
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Post by reaper on Aug 7, 2009 8:55:56 GMT
and that is a bit too much i presume thanks for the clarification. I have a conductivity meter here somewhere, so i'll check the values myself later today if i have the time to see if those values magically differ from the test results, although i doubt it. edit: found he conductivity meter, but affer 12 years without using it, the batteries were totally stuck, and i tore some connections off just trying to replace the batteries. Threw that one away
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