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RE: Reconstituting RO/DI Water
1) The percentage depends on the target parameters you want. I'm known for
going rather soft, and my water is rather hard (15 degrees dH and 15
KH). So I might add from a pint to a gallon of tap per 10 gallons of
r/o. And sometimes I just add all r/o. My r/o has a conductivity of about
20µ, and this is ideal for breeding some of my more challenging species.
The formula for knowing how much to add is rather simple. I guess I'll
restate it: Multiply the number of gallons times the hardness for each
water source, add the two results, and then divide this sum by the total
number of gallons. So if my r/o is a half dH and my tap is 15dH, then 10
gallons of r/o plus a gallon of tap sums up to 5 +15 = 20. Divide that by
11 gallons and I see the result is close to 2 dH.
But I also have invested in various "salts": Calcium chloride, Calcium
sulfate, Magnesium sulfate, and Potassium chloride. These allow me to mix
the right combination of ions -- in case I really, really want to replicate
some readings. But for now, I've only done that for experiments when
working with challenging tetras.
I guess I should also mention that for my spawning tanks (for black water
tetras) I often use straight r/o with black water extract. I think the
extract adds a little something while keeping the water quite soft and
acidic, but the fish are not stressed.
2) I assume that Instant Ocean is mixed for marine use, and not to mimic
Amazonian streams. Read the product's ionic content. Does it sound
comparable to what you want? My point is this, while it might be important
to add the right amount of hardness back, it is also important to add the
right types hardness back.
I would assume that R/O Right would be better than Instant Ocean,
especially if you are keeping soft water fishes like most Apistos or tetras.
3) Yeah, I know. I realized the double meaning of "salt" when I wrote my
response. As a result I just got winked at ;-) there... got you back ;-)
At 10:24 PM 3/23/2002, you wrote:
1. at what percentage of bypass water or tap water would you recommend
2. I realize the original question was stated with NaCl. however I use
Instant Ocean as my tank "salt" of choice if and when I add any "salt" at
all. Would this change your recommendation at all.
3. the calcium, magnesium, and sulfate that are in your water are also salts
(Dad was a chemist) So I would say you do recommend adding salt, just not
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