There are some differences, but the basic effects are similar. Both will raise the pH, alkalinity, and calcium. The Nielsen reactor is set up to dose a saturated lime solution, and you can make the same strength solution with topoff.
The topoff approach has some advantages. You can tune the strength of the solution more, and by letting the kalk settle after mixing, some contaminants will precipitate out of solution. Also, vinegar can be added to the mix, for various effects. The Nielsen reactors are somewhat less time-consuming, though.
<a href=showthread.php?s=&postid=6564376#post6564376 target=_blank>Originally posted</a> by Randy Holmes-Farley In addition to those differences, it is sometimes hard to get the limewater saturated with reactors if you allow it to settle at all.
Help me understand your statement Randy. Why would it be hard to get the limewater saturated with reactors if you allow it to settle? If it's already mixed and saturated, and it's not exposed to air, how would it lose it's saturation?
My guess is that, assuming the standing container had saturated limewater, that the reactor was dosing particles as well as dissolved solids, so was not just limewater.
It is quite possible that I did not mix the standing container well enough. I was putting in more kalk than needed.
I've collected a couple of samples straight from the reactor after letting it settle the 1 hour after mixing and i'm finding no 'particles' in the doses.
It depends on the reactor design, but many won't dissolve much of the lime without stirring. If it is maintaining alkalinity in your aquarium, however, it is doing fine.
I'd check the effluent and see if anything is dissolving into it. Conductivity is the best way, but pH can also work. IT may not be dissolving much at all without stirring.
This article describes more about using limewater:
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