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The Hydrotech 92015 is the correct replacement filter for the following systems:
The Hydrotech 92015 Polyphosphate Feeder Cartridge is a replacement water filter cartridge for the Aqua Flo D75TFC-3 Reverse Osmosis Drinking Water System. This polyphosphate feeder acts as a scale inhibitor and is used in "D" models only. This polyphosphate filter should be replaced every 24 months.
Hydrotech 92015 Polyphosphate Feeder Cartridge specifications: