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It would be interesting to force air through a diffuser, and see what ppm results. A normal air-pump probably wouldn't work. It might need a high-pressure air-compressor. I think you can buy them for Aeroponics. But even then, the oxygen might cause too much turbulence, and degas the water. If...

If the filter is struggling to swallow CO2 bubbles at 1bps, maybe the diffuser is too close. My diffuser is to the side of the intake. About 2/3rds of the bubbles - the finest ones - are sucked into the filter, silently. The larger bubbles just percolate up to the surface. My filter doesn't even...

Fairy liquid and water, applied to the regulator joints, will produce bubbles from the leak, if there is one.

I can vouch for this one. Although I got a faulty one at first, and had to get a replacement. It takes 10psi of pressure to allow CO2 through at all. But it seems to work. I don't see any water climbing up the hose.

I'm not sure, either. I'm loath to correct it. The ambiguity appears meaningful. Whether it was the test kit or the solution that was fairly accurate, I don't know. The test kit claims a 0.3 +/- dKH accuracy. The 4 dKH water claims to be accurate to 0.01 ppm. Perhaps that helps.

You don't need much 4 dKH. And it isn't all that expensive. You can even make your own, with a decent KH test kit, DI water, and Sodium Bicarbonate. I recommend the Salifert KH test kit. I tested the 4 dKH water from AE and it was fairly accurate (that, or they use the same kit to mix the...

Aquatics Online still sell replacement carbon blocks. The effectiveness apparently depends on the carbonate hardness. From the Tropica website:

An airstone below the filter inlet might give you a fighting chance. I'm assuming the CO2 is just bubbling from a tube? The bubbles are probably too large for the filter to swallow. Large bubbles tend to float to the top. Smaller bubbles are more neutrally buoyant. Silly question, but did you...

Here's an update. I ordered the Lunapet kit on Monday evening. It arrived this morning. I think I made the right choice. Just using the 500g bottle for now. This company look promising for refills. I appreciate the feedback you guys gave me.

How long did it take for your delivery to arrive from Germany?

I'm grateful for the replies. My main concern is the 30 quid difference between Ultimate Aquatics and Aquatics Essentials, for what appears to be the same regulator. I emailed Ultimate Aquatics and got a terse reply suggesting perhaps AE were 'greedy'. Maybe if it was 10-15 quid difference. 30...

I am considering this Deltec CO2 regulator. I was going to get one of the German ones, but once delivery is factored in, they're about the same price. Anyone tried one of these, or heard anything about them? It looks the same as the D-D one from AE - which looks, more or less, the same as the...