DIY passive RO generator

Khemul said:
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Come to think of it, this forum could use one.

Also needs one of these...
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Whatever. You obviously can't be reasoned with. Everyone else has presented science/fact/basic logic/experience, and your argument seems to be you believe it works. If the concept worked you could explain your 'science'. If your concept worked you could explain how it works and show the numbers that prove it works. If your concept worked you wouldn't have to use the superior attitude. Religious concepts can't be adapted to all real life situations. Just because you 'believe' it to be true doesn't mean the universe will adapt itself to work around the concept. But arguing about it is pointless. It is obvious at this point that you are incapable of actually rationally discussing the concept. Running around saying "you just don't get it" isn't an argument. It's what people do when they can't come up with a basic argument. Shame everyone doesn't outgrow the concept in early childhood.

As wesleydnunder pointed out, at this point we are beating a dead horse.
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Agreed
 
You just need another (empty) tank to put tap water in, then make a Visqueen tent so that it pours out into a 55 gallon drum or something. Then you'll have pure water for water changes.

Or what if you had a stump that your main tank overflowed into, then have a Visqueen tent so that the clean water drips back into your main tank? That way, the stump will just be pure sludge and you'll never have to do water changes, just stump cleanings. :)
 
Alright you naysayers, check this out. My tap water TDS is 633 ppm. TDS in sample tank was 724 ppm. After two days sweating with the plastic cover, TDS has dropped to......

10tds2.jpg
:rofl:

Weirdly my Tetras, Plecos, Rams and even fry seem to thrive in this water, though, so it's probably harder on the equipment than the fish and I shouldn't worry about it.

10tds2.jpg
 
You should try it again in a week or so. A 0.7% change might be simply due to inaccuracies in testing... I would consider a 5% change significant. :)
 
Jannika said:
Alright you naysayers, check this out. My tap water TDS is 633 ppm. TDS in sample tank was 724 ppm. After two days sweating with the plastic cover, TDS has dropped to......

View attachment 177366
:rofl:

Weirdly my Tetras, Plecos, Rams and even fry seem to thrive in this water, though, so it's probably harder on the equipment than the fish and I shouldn't worry about it.
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My tap water fluctuates between 650 and 750 Cal/Mag PPM. All my fish are well acclimated but start having trouble over 1200 Cal/Mag PPM. In winter it wasent such a big prolem and the balance between having 360 or full nitrogen cycle aquariums and the climb in TDS due to evaporation and adding more Cal/Mag top off would get me 6 to 8 weeks between water changes with otherwise excellent perimeters in all toxin levels almost 0, except for Cal/Mag TDS. In summer here in BHC AZ with humidity at 5% and home AC making that number even lower, evaporation is greatly accelerated increasing the amount of dissolved minerals per volume of water, then topping-off more high Cal/Mag water would make TDS skyrocket. Using water changes purely to stem the increasing levels of TDS were back to being conducted weekly which were otherwise unnecessary for ME, usually only every every 6-8 weeks. So my evaporative system of purified recaptured water is not to lower my TDS but rather to prevent TDS climb in the first place or at least greatly diminish the affects. As wanabediver pointed out if one water to further lower the TDS or create separate purified water cleaner then RO home systems, one would only have to setup a separate evaporative generating station and once that water from a separate tank was depleted, recaptured and directed to your main tank, of course your TDS would be lowered in your main tank. But you would have to clean out all the white Cal/Mag deposits inside before starting over at NO cost, just like tossing out an expensive RO membrane. So you can see that your on the right track becasue this is not rocket science, buy rather stuff most of us learned and were present for in 3rd thru 5th grade elementary class with a little arithmetic flash cards to help connect the dots. Oh well at least for those like yourself its not a wasted point.:idea:
 
A TDS reading dropping from 724 to 719 is not that big of a deal. So many things go in to TDS, plants can increase TDS if some leaves/roots are dying off but they can also reduce it by taking small particles/minerals out of the water and using them, some TDS could end up getting into the substrate lowering TDS reading while if a fish were to stir up some substrate that could easily raise TDS a couple points. Filters even have the ability to lower TDS or raise TDS depending on how they are working.

Interesting first reading, but as stated above, don't take too much into just two readings over two days, keep the readings up every other day for the next two-three weeks and you should get a good idea of how the 'system' is working
 
TDS readings are still based on conductivity, so even a fluctuation in temperature could cause such a small drop. When you start seeing readings >50, then that would be significant. But, it's simply not possible.
 
very nice, but it's not anywhere near RO...
reverse osmosis = pushing against the concentration gradient.

what the plant it doing is drawing water up from its roots and actually performing osmosis.
osmosis = going with the flow ;)

I don't mean to be a jerk, I just wanted to point that out ;). I do like your concept though. I'll have to try it someday. And it is filtering is done biomechanically and/or by condensation.
 
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