nilsen system...

[mathias]

what you think about a nilsen system?

http://www.myreefcreations.com/nilsen.htm

[ratboy]

That is almost identical to what I have but I made it myself! Find a magnetic stir plate on ebay for ~ 40$ (mine even lights up!). After that its a few bucks in pvc pipe and fittings and I have a unit that has worked flawlessly for 2 years.

http://cgi.ebay.com/magnetic-Mixer-Stirrer-with-chemically-coated-stir-bar_W0QQitemZ7615537740QQcategoryZ119121QQrdZ1QQcm dZViewItem

[ratboy]

I now have my RO top off run into a acrylic resevoir and then use timers to dose the water into the reactor and another for the mixing timers. I could have just hooked the top off to the reactor but I dont trust float valves or LLC's. Sure timers arent 100% either but my dosing pump rate is much lower than my RO output so it gives me a bigger window of opportunity to find and correct a problem if it gets stuck on dosing.

http://i29.photobucket.com/albums/c264/eswansiger/right_view_sump2.jpg

edit** Dont freak about the temp on that digital thermometer. That thing went out with the trash shortly after I setup my tank!

[hammondegge]

what do you use as a stirrer? and does it wear down the flange material?

[ratboy]

I use the teflon magnetic stir bars you use in chemistry lab (mine came with 2). I had a clear acrylic chamber when I first made my reactor but the seal broke on it at the bottom(kalk weakened the weldon seal and it started dripping). What ive used for the last 2 years is a pvc blockoff flange on a pvc 3" pipe. I just recently cleaned it out and I didnt see any wear on the magnet or the pvc.
I cant identify plexiglass on this chart but assuming it has similar chemical resistance properties to polycarbonate, PVC is more chemically resitant to Kalk (Calcium hydroxide).

http://www.buerkle.de/eng/d2-1.php

[hammondegge]

very nice. thanks