I was in the process of making a new Kalk reactor and researched a lot about materials. I was originally going to use PETG but found out it will break down. I put some filament in kalk solution and it did indeed become brittle and was able to break apart easily. This took about 2 weeks to notice. Recommend using ABS but I have yet to test that.
All good points!Interesting thread. I'm heading down a kalk stirrer journey myself to supplement a CaRX for the pH boost. I'm having the same issue where the recommended dosing per the calculator doesn't check out. I'm dosing more kalkRX vol than I should be in order to maintain my alk. This lead me to thinking maybe my kalk is bad which I recently replaced with the MS Coral brand. Shows a bit of an improvement, but still things don't add up. So now I'm checking the gear.
Your mod is very interesting, but question to the overall stirrer experience: When you stir before the mod, do you see the expected white cloudy water? If so, then wouldn't you expect the stirrer to be doing it's job without the mod? I tried playing with the stirrer timing to stir approx 20 mins before dosing time for the kalk to settle. I'm now down to an hourly stir!. If we're all seeing milky water, shouldn't we all assume it's mixing well?
I'm replenishing the kalk weekly per a couple scoops, but I'm starting to see thicker and thicker layer of kalk at the bottom which eventually need to get removed if it's not doing anything. I can't imagine our experience here to be the norm.
All good points!
I made the mod to try and "push" the slurry at the bottom higher in the stirrer so the fresh water feeding the stirrer would be forced to go through the slurry a little more.
While I did see an improvement, in the end it didn't solve my issues long term. So I've gone back to mixing up fully saturated kalk/water in larger quantities (15 gallons at a time) and just using that.
I think the stirrer is a great add if you only need a little boost or are just looking for the ionic balance it's supposed to provide. And it did seem that the mod helped with that. Unfortunately, my situation requires a fully saturated mixture, which I was ultimately never able to sustain with the stirrer long term.
I might try Geo's kalk reactor one day, since it mixes differently, using a pump instead of a stir bar. I used one 2 decades ago and it worked well from what I recall, but I really didn't know what I was doing back then either! haha
I thought the whole point of the stirrer was to ensure fully saturated kalk water by keeping the kalk mixed with new fresh water? Isn't it equivalent to you mixing at 15 gallons at a time just doing it constantly?
One thing that I never agreed with on the avast kalk stirrer is that it rotates too slowly and is intended to only run on occasion.
Me, being a DIYer at heart have tackled this by making my own kalk reactor, and changing things that I thought were limiting factors in commercial units.
I made a magnetic coupled stirrer that uses a 3d printed paddle that also has a 3d printed ceramic thrust bearing on the bottom to limit wear.
I can control the rpm so that it can maintain the proper cloud level. By doing this, I am able to maintain full saturation of the effluent into the sump.
The paddlenis printed in 95a tpu, it seems to hold up a lot better than petg at the higher pH. My 1st iteration was petg and that fell apart after 6-9 months.
Because it's running 24/7, the kalk doesn't get a chance to settle. When I refill it, I add 1 pound (roughly 3 cups I think) about every 10-15 days. If the power were to go out and the kalk had time to settle, it would probably take some work to get the paddle free.Cool looking for sure. How well does it hold up against the unmixed kalk layers at the bottom? And are you dosing cloudy water since you're stirring 24/7? BTW. I think the AV now running constantly, but yes slowly which is why I asked about the cloudy water. I did a DIY myself and my entire reactor turns white when it stirs but I'm allowing it to rest and settle before dosing. .. and experiencing the low potency issue that lead me to this thread.
Because it's running 24/7, the kalk doesn't get a chance to settle. When I refill it, I add 1 pound (roughly 3 cups I think) about every 10-15 days. If the power were to go out and the kalk had time to settle, it would probably take some work to get the paddle free.
Here's a video I just made to kind of explain the stratification between the slurry and saturated calcium hydroxide.