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| Drum full o' cat litter |
Last year at the end of July I posted about our experimental cat litter composting solution in The Cat Poop Portal post. It's been a while since we reported in, and I've received some gentle pokes from readers, so this is an update.
Long story short, it's going slowly. At the time of the last post we'd installed a 50 gallon drum in our side yard. That drum filled up fast. We have two indoor cats now (I think we only had one when this started) and they are slinky little poo machines. Also, we were using pine pellets which require a complete change-out more often than clumping litters, so we managed to fill the drum in about four months. That was faster than I expected, and a little disappointing, but there are two ways to ease this problem.
1) Changing litter, so we use less. Most clumping litters are either clay-based, which is not good for compost, or have sketchy chemicals in them. We've recently found World's Best Cat Litter, which is a clumping litter made of corn. I called World's Best to make sure there was nothing added to the corn, and they promised me that there's nothing added to the standard formula--the magic is all in the way the corn is processed. So yes, we're supporting Big Corn...but what are you going to do? The stuff works really well and is compostable. Now that we're using it we'll reduce our overall litter waste volume. (Of note: our friend John, a madman with six cats, swears by Swheat Scoop, which is wheat based. I don't find it works for me, but he blames my litter management skills. It's an alternative.)
2) We're offloading half-finished cat compost to My Big Fat Worm Bin. Regular readers (and Vermicomposting workshop participants) might remember that composting expert Nancy Klehm had us add a good amount of mature cat litter compost to the mix when we built up the bedding material for the worms. She said she wouldn't want to foist raw cat litter on the worms, but when it was well broken down they could handle it.
The drum has been, shall we say, resting productively over the winter. Today I went and dug it up to see how it was doing. As with any pile, the stuff on top was less finished--it looked pretty much like a cat box. It isn't stinky, though, as long as I make sure all the cat poo is buried.
Down lower the material was more broken down. It's an interesting rusty orange color. But I didn't get the sense of lots of activity going on. It was a cool pile, and it showed very little insect life. This is not necessarily a bad thing. The pile is decomposing, just on a long timeline. But at this rate of decomposition I suspected it would need at least another year of sitting to be fully broken down, and then it would need to rest even longer for safety. Compost made from carnivore and omnivore poop needs a two year cycle to allow the pathogens to die off.
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| Digging down all I see is decomposing red sawdust |
Wanting to move it along faster, I did what I'd do for any compost pile that was a little pokey: I turned it, and added nitrogen and water.* Shoveling 50 gallons of kitty litter is exactly what I want to be doing on any given Saturday! As I shoveled, I decided that if I didn't already have Mad Kitty Disease, I'd have it by the end of the day. As if to confirm this, Trout sat in the bedroom window over the poo-bin, wearing a peculiar, self-satisfied expression while he watched me slave away over his waste. (Phoebe didn't join in, because she doesn't admit to creating waste at all.)
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| Okay, he doesn't look smug here because he's wondering what I'm doing with the camera. Prior to this I assure you he he looked very smug. |
Just like turning, adding a nitrogen source to the pile heats it up. All compost piles are a balance between carbon and nitrogen sources, aka "greens and browns." Too much carbon and your pile is cool and slow. Too much nitrogen and its slimy and stinky. But if you get the balance right, you end up with lovely compost.
In kitty litter composting, the litter is the carbon and the urine and poo deliver the nitrogen. Starting out on this path, I had no idea how the natural carbon to nitrogen ratio in a cat box would play out. Now it seems to me that the ratio is carbon heavy. Cat litter materials, such as compressed sawdust, are really dense carbon sources and need tons of nitrogen to balance them.
So my preliminary finding on this point is that it might be help to add extra nitrogen when you add a new layer of litter. Extra nitrogen could come in the form of green yard trimmings, veg scraps, urine, fresh horse manure, etc. Today, though, I decided to add alfalfa meal because we had some wasting away in the garage. Alfalfa meal is ground up alfalfa. It's used as a natural fertilizer and top dressing, and is high in nitrogen. Generally speaking, I think nitrogen should be free, but if you don't have a lot of scraps/trimmings/spare urine around, you could do worse than to have some alfalfa meal on hand to perk up your compost pile if it's gone carbon heavy.
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| Mixing in the alfalfa meal and water |
When it was all done, I thought my pile looked a little more loved, and I think it's going to heat up nicely. I was able to move ten gallons of the more mature compost over to the worm bin, but the barrel is still pretty close to full.
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| Adding the kitty compost to the worm bin |
For the near future we'll probably be able to send about half our litter to the barrel, and the other half will have to go to the landfill. Eventually we'll get rid of this big mass of pine litter, and I hope that by using the clumping litter will keep the bin from filling up quite so fast, and will somehow reach cat:compost equilibrium.
*To be clear, I added water because the pile was dryish, not because water in itself is a magic activator to be used in all circumstances. If a pile is too wet, I'd blend in dry stuff while turning. The goal is for the materials in the pile to be about as wet as a wrung out sponge.
