Working from first principles, let’s discuss the MUSTs and MUST NOTs of the auto chlorinator; there is little-to-no wiggle room on these requirements and they are in no particular order.
- Liquid-tight: Electronics and chemical solutions must be isolated from moisture.
 - Quick to prototype: We can’t rely on third parties because our time budget to first working prototype is 2 — 3 months.
 - Easy to scale: We won’t commit to large-scale mass production runs until the business proves itself. This means no multi-thousand dollar injection molds.
 - Open source: We’ve chosen for our software to NOT be “proprietary” and will release it before launch.
 - Resilient til the end: If we go under, or the power goes out, or the internet fades, the AutoChlorinator™ must continue to march on.
 - Easy to repair: Owning something obsolete is frustrating and wasteful. The AutoChlorinator™ must use off-the-shelf components that can be easily obtained and installed.
 - Easy to maintain: It should be really simple and obvious how to charge the battery and top up fluids (chlorine / reagents).
 - Float-able: It must float.
 - 6-month supply: Battery, chlorine storage, reagent storage should be designed to last for at least 6 months without intervention.
 - Chemical resistance: We’re dealing with chlorine and other potentially dangerous chemicals; all materials and components must operate safely.
 - Just throw it in: The AutoChlorinator™ must be easy to set up by anyone within one minute.
 
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Tired of spending frustrating hours checking, measuring, dosing your hot tub... over and over? Your hot tub is for enjoying; it's not for practicing chemistry.