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Any container which supports weak acids lower than 3% will be suitable.

Ideally, the liquid should be kept away from direct light, but if light hits it for a small part of the day that is fine.

Hi,

1. 500ml

2. 1-3ml reagent used per test, how long a bottle may last will depend on tests/per day and actual KH value. A 500ml bottle may last up to 3 months if testing 2x/day at a value of...