Wish I would have known about reactors back when I was blowing money on lava lamps..... LMAO. I could watch media boil for hours under the right conditions......
Haha thats pretty funny. I purchased a .9 ft3 bag of chips back when I was building the first one (55g cylindrical container). I removed some of the k1 and bio chips a little while back to help seed a new tank but I am probably around 2.5-3ft3 k1 and .6 ft3 bio chips currently. So I am pretty close to the 4:1 or 5:1 ratio in the 55g and other reactors as well.
My best suggestion would be to start at around 1/2 the recommended amount of kaldnes for the container size you are using and let that media cycle properly (you can always add more). It takes time, just because its boiling and rolling well doesn't mean you filter is cycled. Anyone adding one to your system that's already stocked and running wont see any type of change in water quality until the media begins developing the thin film (unless they're using K1 as a type of static bed for trapping fines). So anyone posting "my fish seem so much more active and happy immediately after adding the reactor to my tank" is just some experiencing some type of strange filtration placebo effect in their mind haha.
Around 3 ft3 of properly cycled k1 can handle around 1lb of feed added to the tank per day as a general guideline. Feed type and nutritional content can be factored in to get a more precise number but for purposes in this thread its not necessary.
I am sure many have already read this but for everyone with basic questions regarding function, design, sizing, media volume, etc. Read (not just skim over) this article.
http://www.raingarden.us/kaldnes_bio.pdf
Here are two calculators to help people struggling with media volume. These offer a good starting point but should be taken with a grain of salt. You may be able to use less media as I said, it is all based on feeding rates of your individual tank.
Square tank
http://koicarp.net/filtration/media/a_calculator.html
Cylindrical tank
http://koicarp.net/filtration/media/b_calculator.html
Ideally, the best way to ensure a reactor is cycled properly is to cycle a new tank and the whole system the old fashioned way with ammonia. Not an option for the majority of participants in this thread unless they are upgrading tanks. This way you are able to take more precise measurements, figure out a good estimate on the amount of TAN your filter is able to process daily etc. Not the type of things most aquarium owners are interested in but it helps to diagnose issues when you have solid numbers you can point to if a problem does arise. All of this has been implemented in aquaculture and koi ponds for some time.
Reed