I wonder whether you could get around the chemicals problem by switching to more ecofriendly in the bathroom (I would guess there are such products Out There, but can't offer any recommendations) - even so, you might want to consider whether anything cunning could be done in terms of choosing/directing outflow so that when chemicals DID need to go down, you could direct them straight to the conventional drain rather than the tank.
I suppose it's far too simplistic to consider two plugholes & a movable plug in the shower base...? (Over-simplistic in the sense that well, of course it would *work*, and be easy to manage when in the shower, which is the critical thing - but I bet most shower bases aren't designed with such a thing in mind, so the execution would be Bloody Awkward and involve tryin to drill big holes & make sure everythin was plumbed in in a non-leaky, building-standards-compliant fashion!)
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Date: 2009-05-18 09:24 pm (UTC)I suppose it's far too simplistic to consider two plugholes & a movable plug in the shower base...? (Over-simplistic in the sense that well, of course it would *work*, and be easy to manage when in the shower, which is the critical thing - but I bet most shower bases aren't designed with such a thing in mind, so the execution would be Bloody Awkward and involve tryin to drill big holes & make sure everythin was plumbed in in a non-leaky, building-standards-compliant fashion!)