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Do you still use the same bubble counter? If not, the bubble size may not be the same as the old one and you will have to "re-establish" your bubble rate.

Should not be the cause of the problem. Since the diffuser is the one which dictates the output pressure at the very end. If you keep bubble rate the same and are using the same diffuser, the amount of CO2 entering the tank is the same. We need to increase the reg's working pressure only when...

Light 14:00-22:00 CO2 13:00-21:00 Air pump 22:00-13:00

1 hr. for me.

I'm afraid no. It's varied too much to have an "average" BPS. There are at least two factors involved. The bubble counter's opening, i.e., faster smaller bubbles vs slower bigger bubbles. And the much more important one: pressure. CO2 can be compressed very well that it becomes meaningless to...

Ah, that's why people claim they see more pearling when they reduce the (water) flow.

He uses BPM (bubble per minute), not PPM. The BPM should stay quite stable. I use CO2 reactors, the BPM will be a bit faster at the start and will get a bit slower and stays there after a few hours. But it seems he uses a diffuser. I don't know what would be the culprit for his problem.

But after taking apart my regulator which is diaphragm based design (have no idea about other designs). I saw it's a very simple equipment. I had been wanting to have a professional two stages regulator such as Victor, Linde, etc. Now, after having added an air regulator to act as the second...

This is what manufacturers say about how long they last: http://www.scottecatalog.com/dsguide.nsf/74923c9ec562a6fb85256825006eb87d/dab60763c15a8267852568f2005ca6a0?OpenDocument IME, my cheap Azoo regulator last 7 years before having to replace the seal-seat. I might have just replaced it with a...

From the pic, there is an o-ring. Generally it should do the job. But I've seen some o-ring related problems in Chinese equipments such as an Atman external pump (advertised as can be used out of water) and an air regulator. The problem is about a surface defect that I think it's called "mold...

Every claim I've found about this seems to be from George and Karla Booth. All the links here are their writings. http://www.hallman.org/plant/booth2.html "After letting the water equilibrate for one day we measured dissolved CO2 at 2-3 ppm. We then set up a large powerhead to circulate the...

About 10 PSI is the minimum for me. But I still prefer 20-25 PSI. It seems the pressure in the reactor (at least mine) is varied between the begining and the end of injection period. A higher output pressure helps make the bubble rate more stable.

I think you're connecting the dots that don't exist. Can't it be that people really don't know how to help this issue or have not read this thread? This kind of adapter is hard to find because not much people need it compared to female CGA-320 to male DIN477 one. This company just popped up in...

:greedy: http://www.klchem.co.jp/blog/2009/09/post_1050.php

They should be open while you're adjusting working pressure because flow rate can affect the working pressure, especially if the regulator is not a high-flow type.

For yeast CO2, I submerged them in the water, plugged the opening and squeezed the bottle.

Normally, CO2 is continuously produced by organisms in the tank. When you takes the water sample and place it outside the aquarium, the CO2 level will be at equilibrium with the atmosphere, i.e., lower than the in-tank level. I think pH 8.1 @ KH 4 is about right with 1.119 PPM of CO2. The 1...

May be that's because you already have high CO2 from the start, dropping 1 unit from that can be dangerous. Do you have film on water surface? It can badly block gas exchange even with good agitation.

The needle on the left gauge moves up the same time the noise occurs. Any sudden change in temperature? Because it's like the pressure in the cylinder is increasing.

This is CO2 Art's tutorial video for setting up the dual stage regulator (the same model as yours). The working pressure is at minimum before the cylinder valve gets opened. http://support.co2art.co.uk/article/59-aquarium-dual-stage-regulator-installation-tutorial Now, this is my opinion from...

It was 2KG for 3 months, 340 litres tank. It should be 4.5 months now as I've reduced the injection down one-third.

The solenoid may be stuck. Or debris prevents it from closing. Try unplugging and replugging it. And if you are willing to open it. Clean it with alcohol. Don't add oil or liquid lubricant (such as silicone) because it will block the movement of gas from one side to another side of the plunger...

I use two CO2 reactors in my tank. I balance CO2 between them by using two IV roller clamps. Just restrict the one that gets more flow and leave another one fully open. Not perfect but works well enough and cheap.

It is called "droop". It's normal for it to decrease a little bit in the injection period. And it should increase back up when the solenoid is closed. My Azoo reg drops about perhaps 1-2 PSI (not sure I just see the needle is not at the same place as when the solenoid shuts), 30 PSI working...

From their videos, for a tank not bigger than 120h, the diffuser will be placed directly opposite the outflow. For a tank bigger than that, such as a 180p, the diffuser will be placed below the outflow. So it's like the location is not very important. This video is interesting that between...

You can make it easier by getting a type of bubble counter that has the opening facing downward, then modify the opening to make it larger. This way, the bubbles will be larger and you can use a slower/countable bubble rate. I make my own bubble counter using a soda bottle and standard airline...

I really wish it was that easy. But... By which bubble counter? Because different bubble counters have different bubble sizes. At what pressure? Because CO2 is very compressible gas. The same size of bubbles between different systems doesn't mean they deliver the same amount of CO2.

1 pH drop when light is on, not 2 hours before light is on. It depends. Mine is 1 hr before the light turing on. As a side note, Tom Barr once said about this: http://www.barrreport.com/forum/barr-report/co2-enrichment/7669-co2-lead-time?p=84330#post84330

There should be bubbles show up at the other end if you wait long enough. If not, I suspect there is a leak.

Apart from the different bubble size, depending on how you set it up, if there are different pressure levels along the line, there can be different bubble rates as well. It can be. Small leak is like that.

I think it depends on the regulator. I'm using an inline regulator (to make my setup 2-stage), it gets 30 PSI input from the main regulator. The output is around 25 PSI. Everything works fine.

It seems our 1.5-2% concentration is at risk. http://msdssearch.dow.com/PublishedLiteratureDOWCOM/dh_0049/0901b803800490ae.pdf?filepath=biocides/pdfs/noreg/253-01338.pdf&fromPage=GetDoc The best we can do may be finding a compatible way to keep the solution acidic...

I think the Tetra pH test kit contains bromothymol blue, the resulting colours match it. See which other brands of pH test kit some people here use in the DC, in case one of them may be easy to find in your area. http://www.ukaps.org/forum/threads/co2-drop-checkers-bromothymol-blue.1724/

An inline solenoid may be an option. That depends on the thing that Fluval call it "Regulator Valve". If it's just a valve, not a true regulator, the pressure on the opening will be the same as in the CO2 bottle (around 800 psi, depending on room temperature). Then the hose that is used between...

Mine is also tap water, takes a few months to dry.

Has anyone seen Tom Barr use a spray bar in any of his tanks? Really, spray bar vs nozzle, which one is better is just a preference, not a fact.

Liquid carbon's main use in this hobby is to kill algae. It's an algaecide with a side effect of providing carbon. BBA, like other algae, is not solely from not having enough CO2. Some people had elevated level of CO2 that their fish didn't survived but the algae (including BBA) still happily...

:rolleyes:

Timer is da boss here. When it's time, the timer cuts the power to both the computer and the solenoid. The solenoid is normally-closed type, means it shuts when there is no power.

All return valves I know need some force to press the seal shut, be it the force of water/air flowing back, or spring to press the sealing ball. But in our CO2 application. CO2 in the line gets absorbed into the tank water, creating vacuum in the line. Water moves into the line. Then the vacuum...

No. It works like a thermostat. But instead of controlling the temperature, this one controls CO2 injection. CO2 makes water acidic and the pH gets down. So it uses the pH to determine when to inject or stop the CO2. A pH controller kit has a pH probe that you put into the water, a...

There may still be some residual CO2 in the water in the morning. Try scooping some water into a vial, then agitating it in front of a fan. This will drive most CO2 out of the water. Then measure the pH. Dropping 1 pH unit from that value should give you about 30 PPM.

Now you are in the category of "gun shy" designated by Tom Barr .;) His comment about this might help. http://www.barrreport.com/forum/barr-report/estimative-index/6473-unless-low-light-plant-deficienties?p=72507#post72507

Well, I thought you said about the very small fish appeared in the Google's search result. Anyway, I also have no idea about these highly oxygenated stream fish. :wave:

This is the first time I hear about “rheoliphic” fish. Google also doesn't help much. So I have no idea about this fish and CO2. But generally, smaller fish are more CO2 tolerant than larger fish. Liquid carbon is not also very safe for animals. It is a diluted solution of a disinfectant...

2-3 PPM vs 0.5 PPM... I think the 2-3 PPM info is probably from http://www.hallman.org/plant/booth2.html . Although the measurement was done by using LaMotte's test kits, the margin of error of 2 PPM and the resolution of 1 PPM might be too coarse for this measurement. And it's an aquarium...

Actually it should be called "liquid carbon" because it's not carbon dioxide (CO2).

What planted tank people use for diffusing CO2 are not regular air stones. The pores are much finer and require very high pressure to push the gas through hence the use of a pressurised CO2 cylinder and regulator, or at least a yeast reactor. And they need cleaning from time to time by soaking...