Your level is almost 30 times the US EPA secondary standard of 0.05 mg/litre for manganese.
You should research what you want to achieve for final water quality, and then get a money-back guarantee from any vendor who sells you a system. You should also get a test for iron as it is often found with manganese.
You need a complete water test and a total solution before you buy a system.
From the link above:
Manganese: (MCL = 0.05 mg/l). Excess manganese in a diet prevents the use of iron in the regeneration of blood hemoglobin. Large doses of manganese cause apathy, irritability, headaches, insomnia, and weakness of the legs. Psychological symptoms may also develop including impulsive acts, absent-mindedness, hallucinations, aggressiveness, and unaccountable laughter. Finally, a condition similar to Parkinson's disease may develop.
There are several processes for dealing with manganese and you should try to learn as much as you can about them before you buy a system. You will want to learn the final quality from the system and the operating cost, as well as the initial cost of the system.