If you are worried about the repeated cost of substrate, you could try to get some custodians in there. You don't have to go 'full bioactive', with plants, but if you add some springtails or woodlice to your coconut substrate (and some leaf litter to top it off), they will establish themselves and help to clean your snake's waste. As long as the substrate is humid, they will breed prolifically and I've found I've only ever had to spot clean when mine soils her waterbowl. (Aside from in the very beginning.) Just a thought if you want to save some money in the long run and avoid having to manually remove and change the substrate whenever it is soiled.

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