Water Ionizer Buying Guide
Water ionizers are a significant purchase. These are the questions we recommend asking about any model, whether you buy from us or not.
1. What is in your water?
Start with your water. Check your local utility's annual water quality report (often called a Consumer Confidence Report), or test your well water. Hard or soft water, chlorine or chloramine, and well water all affect which filter and model make sense.
2. Filtration
- What contaminants is each filter rated to reduce, and by whom?
- How many gallons or months does a filter last, and what does a replacement cost?
- Are there options for pre-filters or whole-house filtration if your water needs it?
3. Electrolysis: plates and power
- Plate count, plate size, and plate material (platinum-coated titanium is standard).
- Power supply type and how the machine performs at your normal flow rate.
- Range of pH settings, including a neutral filtered-water setting.
4. Hydrogen output, measured properly
Ask for dissolved-hydrogen figures in ppm or ppb, at a stated flow rate and setting, measured with a dedicated hydrogen meter or titration reagent. Be cautious of hydrogen claims based only on ORP.
5. Cleaning and maintenance
Minerals can build up on plates. Look for automatic cleaning cycles, and ask how often manual descaling is recommended for your water hardness.
6. Installation style
- Countertop: faucet diverter, easy setup, portable. Shop countertop
- Under-sink: dedicated faucet, clean counter, more involved install. Shop under-sink
- Commercial: higher flow and duty cycles for offices, gyms, and businesses. Shop commercial
7. Warranty and support
- Who honors the warranty: the manufacturer or the seller?
- What is covered (parts, labor, electrodes, shipping) and for how long?
- Is there U.S.-based support, and how are repairs handled?
8. Certifications and safety
Ask which electrical safety and water-contact certifications the unit and filters carry, and request documentation.
9. Total cost of ownership
Add the machine price, several years of filters, and any installation costs. Compare that to what you spend on bottled or filtered water today. Our H2 Advantage page walks through the comparison.
10. Be wary of big health promises
Reputable sellers do not claim ionized water cures or treats disease. If a seller does, treat it as a red flag. See our Research & Studies page for what the evidence actually says.
Questions before you buy?
Our team can help you compare models for your water, household, and budget. Contact us or browse countertop, under-sink, and commercial ionizers.
This page is for general education and is not medical advice. Water ionizers are drinking-water appliances; they are not intended to diagnose, treat, cure, or prevent any disease. If you have kidney disease, take medications that affect potassium, or have another medical condition, talk with your doctor before changing what you drink.