For removing chloramine for the flowering plants get a refillable carbon filter and fill it with catalytic carbon. Catalytic carbon is a special type that removes difficult molecules like chloramine. There is a filter casing called a big blue and they are about 30 bucks for a 10" housing. Then get a filter cartridge specifically for it that is refillable for about 10 bucks. The catalytic carbon is the expensive part. But if you buy some it will be enough to last a few years as one filter full lasts 6+ months.