Before the BlueLine70, what pump were you using? the DC pump or the factory 1/4HP RK2 pump?
just curious....
also, because i know nothing other then the picture of the RK2, why cant you use the "garden sprinkler" valve? if its a 12-24volt valve, just run a converter over to your controller, and let it regulate the voltage down for you.. just an option. (if you think its not letting enough water pass, just install 2 with a tee on both sides. this will let 2x the flow past. plus you can pick them up at your local Bigbox store for a lot less....
just another option..
Mr. W, honest opinion.
i know you have dealt with a lot of CA reactors over the years, why was the Schuran picked? was it a part of the original build before you came on or what? i have never used one but they seemed (to me of course) to be a little over priced. are they that much better then the ones found on/manufactured on this side of the ocean? just curious.
(if you had to replace the unit for a local brand, what are some choices that you like or prefer? thanks)
The RK2 throughput pump was the monster pictured earlier. It was replaced with an efficient DC pump. The venturi closed loop bubble generator pump was the stock RK2 Dart clone. It's a low pressure pump and it is direct drive. We have replaced all direct drive pumps with magnet coupled chemical pumps. This way there are no leaks, corrosion, or bearings to replace every 2-3 years. The pump I just took off had a slow leak in the seal already. It was encrusted in salt. It was a night and day difference with the pump upgrade.
The garden solenoid is broken at the actuator side, the controller is still working. The other thing we don't like about it is it squirts water out of the side when it goes on and off. Not a problem in a garden, but not good when it gets the plasma light control wet

We have considered buying a new garden-grade unit, but the controller it comes with is likely proprietary. We need a chemical grade actuator for the inner wash-down so we will use two new chemical valves... but I'm not crazy about the price tag
We changed almost everything from the original build, but the calcium reactor is one of the things that stayed, mostly due to the amount invested and good reputation of the product. I don't see much value in the three jets on the bottom of the reactor, and they don't cost much to make. Especially with large media, a simple drip plate would be the same or better. The control valves are cheap airline valves, but if they work they work. It has a cone shaped top to help collect stray Co2 and redirect into the system, but most manufacturers have this feature. The Eheim pump is nice, but again, many manufacturers here use this as well.
I've seen them from $850 - $1350 on the web and agree that the price isn't warranted. As I mentioned before, it doesn't have a second pass reactor chamber to lower PH, so you need to ad this yourself. We are feeding the effluent drip line into the mangrove system at the top so residual Co2 can be utilized by the mangrove leaves and the Miracle Mud can buffer the Ph back up to 8.4. If we add macro-algae it will remove the Co2 (carbonic acid) from the water as well.
The Schuran has an oversized bubble counter (not sure why), but no drip counter (not sure on that either). The fact that I was able to crack the media chamber in three places on the top and bottom by hand tightening four screws (top & bottom) leads me to believe that the thin wall acrylic and end caps are poorly bonded and designed. If they used a thicker tube and more screws to spread the torque, I wouldn't have this problem.
My (cynical) prediction is that Schuran will charge $500 for a replacement body and I will have to wait & pay for it to be shipped from Germany. I believe that I can find an equivalent or better CA reactor here in North America for the same cost as the replacement part. Hopefully I'm wrong and they can send a free replacement from a distributor in the US. I think I can get a stronger replacement part fabricated locally for under $100.
I don't have a favoirite CA reactor right now. Someone recommended a digitally metered Co2 regulator earlier in the thread that I like. I would incorporate the following features if I was designing one...
- Peristaltic dosing pump for versatile and accurate throughput
- Digitally metered Co2 regulator
- Final pass PH buffer chamber
- Fluidized bed reactor chamber
- Mixed dolomite & aragonite fine media
- PH controller/probe holder with easy to read (large) dual display (set value & current value)
- Eheim closed loop pump
- Easy to view, "set & forget" drip counter
Supplemental:
- Calcium chloride solution tank with dosing pump
- Magnesium chloride & magnesium sulphate solution tank with dosing pump