That was my thought too.. I totally forget my test kit on the kitchen counter.The filtered is probably RO, then.
I'd guess the tubes are in the kit, but other vessels could be commandeered for the purpose.Why not just take the samples home?
I thought about it, but poking around the kitchen to find something that wouldn't send the water all over my car on the way home proved fruitless.I'd guess the tubes are in the kit, but other vessels could be commandeered for the purpose.