5 years? I don’t believe that at all. They don’t last more than a year even if maintained properly. It’s lying to you at this point.

NEVER buy a digital pH meter. NEVER. Throw that shit in the trash and use test drops.

Hydro is too delicate for seedlings for most new growers. Better know what you’re doing. There will be no forgiveness. Coco and soils are forgiving. They create a buffer. Water temp and pH better be on point 24 hours a day or you’ll run into serious problems.

How are you measuring pH? Digital meters will lie at some point. They don’t last long even with proper care. 400 ppm is fairly hard but there’s much worse out there. You may want to filter it a bit to get it under 300. It will be difficult to maintain an acidic pH with high calcium (alkaline) water. Cheap pH down would mainly consist of…

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