Seven plate water ionizers are considered to be mid-range models. They usually have more power than five plate models, and can reach higher pH and ORP levels. These machines usually have longer warranties than five plate machines.

	Life Ionizers MXL-7	Enagic Leveluk SD-501	Alkaviva Athena H2	Alka Prime S7	Chanson Miracle M.A.X.
pH Rating	4.0 – 10.8	4.5 – 10.3	4.7 – 10.8	5.0 – 10.4	6.4 – 10.1
ORP Rating	-701	-612	-632	-500	-488
Filtration	Three (Customized) Filters	Single Filter	Single filter	Single Filter	Single Filter
Price	$1,997	$3,980	$2,395	$1,697	$2,195
Power	450w	230w	150w	200w	125w
Convertible	✔	—	✔	—	—
Warranty	10 Years (Limited)	5 Years	5 Years (Labor)	7 Years	Lifetime (Limited)
Recommended by Nu Tech Water:	✔	—	—	✔	—