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safe PPM range for CPs?
- Thread starter SirKristoff
- Start date
seedjar
Let's positive thinking!
I've been told that <100 is OK for some CPs, <50 is good for most all CPs, and <25 is about the point where you stop seeing any further benefit for greater purity. But that was back when I was researching RO systems a few years back. Now that I actually have a filter, I've kind of forgotten about it. ;P
~Joe
~Joe
theyellowdart
sea bear returns!
seedjar
Let's positive thinking!
You get the smart prize of the day. That's a very significant detail. I assumed water hardness as well.
~Joe
theyellowdart
sea bear returns!
Lol, no I don't. I just realized I misspelled million. Thanks anyway...
I actually grew my plants outside using well water (I thought it was good before droseraguy tested it). Turned out to be ~350 parts per million. My nep looked better than ever, and the sundews didn't look too shabby. I think the occasional top watering of rain we got (once or twice every 2 weeks) was enough to keep minerals from building up.
nightsky
Lover of Mountains
Good points, especially the one about checking multiple times per year. Depending on the source(s) for your municipal supply - there could be very large differences seasonally or even week to week. One example that I've seen is a town getting its water from a mountain stream for winter & spring but deep wells for summer & fall. The TDS was a step function between the two. A TDS meter & periodic testing is a cheap insurance policy (it also will let you check the rinse water of your sand or perlite to see how many ppm comes from them when mixing up new media ....
)As others have noted, this tends to be in a range that most consider acceptable. However, I usually like to think a bit about 'rules' that others use and how they fit my particular situation. For example, as another poster noted - lets say 100ppm marks the range for 'unacceptable'. If that's true and your water remains ~20-25ppm, you'll have 4-5 times as long before your media becomes as 'unacceptable' as if you were using the 100ppm water. It's not that your water is permanently ok. Of course, you must also consider your conditions and the plants you grow. Some neps & pings seem to like hardness (to some degree). Are your plants outside where they get a periodic rain flushing or are they permanently inside where water evaporates everyday - concentrating the salts?
Ron - it depends on the time of year.
My temperates are obviously outdoors all year, but my neps are inside during the winter and outside during the summer - but ive got a greenhouse going up here in a week or so thats going to change.
I imagine i will get some RO water, and once every few months flush the pots with the RO water and just water with the tap water.
My temperates are obviously outdoors all year, but my neps are inside during the winter and outside during the summer - but ive got a greenhouse going up here in a week or so thats going to change.
I imagine i will get some RO water, and once every few months flush the pots with the RO water and just water with the tap water.
