A little sidenote between shows and new enclosures: a friend and Day Job coworker took recommendations on carnivorous plant care in Dallas to heart and came across something that would have slipped between the cracks otherwise. As related elsewhere, the municipal water in the greater Dallas area is best described as “crunchy”: seeing as how we’re situated on what used to be North American Seaway ocean floor about 80 to 90 million years ago (with big areas of Arlington, Irving, and Flower Mound peeking up as barrier islands akin to today’s Padre Island), water out of the tap is full of dissolved salt and calcium carbonate. Up in Flower Mound, the water is also so full of dissolved iron that you can tell which residents have lawn sprinklers by the wide rust stains on driveways, sidewalks, and sides of houses. All of these are really bad for carnivorous plants, and a lot of people have issues with them, too, so Dallas people tend to drink a lot of bottled water. (Not me: I actually like the flavor, and the only bottled water that catches my interest is the even more mineralized Mineral Wells product, and I’m fairly sure that when I die, my bones will glow in the dark from the dissolved radium I imbibed as a kid in Saratoga Springs.)
Anyway, my friend noted the regular Triffid Ranch admonishment “Rain water or distilled water ONLY” with a recently purchased Cape sundew, and found what she thought would be a great source of distilled water with a new brand called Zen WTR. It makes a promise that it’s “100% vacuum-distilled water,” but not is all as it seems.
Let’s start by noting that for this discussion, we’ll take all of Zen WTR’s claims at full face value. No snark, no arched eyebrow, nothing. The claims of using 100 percent recycled plastics is a noble one, as well as using only ocean-salvaged plastics. (I’m currently working on a Nepenthes enclosure that asks what plastics would look like after 50 million years of burial, and the reality is that nobody’s quite sure what’s going to happen to all of the various plastics we’re turning into signature fossils for the Anthropecene.) I have no reason to doubt that the water isn’t 100 percent vacuum-distilled for maximum purity, either. But is it safe for carnivores?
Well, the first tipoff was noting that the contents at the bottom of the bottle read “Vapor distilled water with electrolytes for taste.” Even discounting the obvious jokes (which I imagine the crew of Zen WTR is as sick of hearing as I am of Little Shop of Horrors references), my heart sank upon reading “…with electrolytes for taste.” Flip over the bottle to read the ingredient list, and…
…and we get “Calcium chloride, magnesium chloride, potassium bicarbonate (electrolyte sources for taste).” None of these are bad in drinking water. If you ever get the chance to drink true distilled water, such as that used for topping up car batteries or keeping steam irons clean, you’ll note that while it’ll hydrate you, it’s not necessarily going to win any taste tests, and a big tall glass of lukewarm distilled water served to friends on a hot day is a good way to guarantee they never to come to your house again for summer activities. (Since cold water holds more dissolved gases than warm water, really cold distilled water is okay, but as with vodka left in the freezer, you’re more likely mistaking the chill for any actual flavor, but that also isn’t necessarily a bad thing.) Spring waters are popular because of naturally dissolved salts and other minerals as part of their makeup, and most bottled water has a pinch of various salts per bottle to improve their flavor and make sure you buy more. Zen WTR does the same thing, and for us humans, there’s nothing wrong with this.
(A little aside, sometimes water that’s too pure can be dangerous in other ways, and not the ones you suspect. When I lived in Portland, Oregon in the late 1990s, the city made a big deal about how the Bull Run reservoir, filled from snow melt, was some of the purest municipal water in the world. What was left out was that it was so pure that it tended to leach chemicals and various metals out of plumbing, and if you lived in a house or apartment in Portland built around the turn of the last century, as my ex and I did, odds were good that Bull Run water and lead pipes put in before World War I and never replaced led to tap output with potentially dangerous levels of lead and cadmium when drunk for long periods. This wasn’t always limited to metal, either: while I haven’t found any confirmation one way or another, small amounts of salt in bottled water may possibly have an effect on the amounts of plasticizer, the chemicals added to give plastics, well, their plastic and flexible properties, from leaching into the bottle’s contents. A bonus fun fact: with most plastic packaging, such as bread bags and Fritos packages, the “Best if used by…” date isn’t the predicted date when the contents go bad, but the predicted date when levels of plasticizer and solvent are detectable within.)
Now, humans are very good at removing minerals from our ingested water: as anybody suffering from kidney or bladder stones can tell you, sometimes we’re a little too good. with most plants, a little salt is completely beneficial, and most accumulations wash out with the next rain. The problem with carnivores is that most live in areas inundated with enough regular rains to wash out most dissolvable minerals after a few thousand years, and more live in sphagnum bogs, which both exude acid and a polymer that bonds to magnesium. In a pot or container, those salts, as little as they are, tend to accumulate. It may not happen right away, and it might not even happen soon, but eventually enough salt will build up in a captive carnivore that it will start burning the roots. In a remarkably quick time, that salt content goes from “minorly irritating” to “lethal,” and with precious little warning.
A few more astute readers may note that technically rainwater can have similar problems with dissolved minerals from dust atop roofs and in containers, as well as dissolved dusts and pollutant accumulated while falling. That’s completely fair, but these are in considerably lower levels than those from Texas tap and drinking water. Please: keep drinking Zen WTR if you enjoy it, but keep in mind that it eventually won’t be safe for your Venus flytrap. And next time, we’ll discuss reverse-osmosis filters and “drenching”…