Super easy assembly Takes about 5 minutes; Have a rag handy to drain water. After the first time, no more instructions are needed. We were shocked to see how dark and cloudy the old filters were. I put new ones in, worked for a minute to bleed air pockets, got good clean water and stronger pressure. Didn't bother changing alarm battery - subscribed instead - new filters every six months would be my trigger, looks like a small investment to improve health and reduce plastic bottle waste.
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