Blue Air DH-S1 Single Water Filtration System for Ice Machines up to 500 lbs, 21,000 Gallon

The cartridge is rated for 21,000 gallons, so the calendar interval depends entirely on how much ice you make. A machine running near the DH-S1's 500 lbs per day ceiling will go through that volume far faster than a 150 lb undercounter unit in a small café. Use the water pressure gauge on the head as the real indicator — a steady drop in downstream pressure means the cartridge is loading up, and most operators pair that with a standing six-month check.

Blue Air rates the single DH-S1 for ice machines producing up to 500 lbs in 24 hours, which covers the BLUI-150A and BLUI-250A undercounter machines and the BLMI-300A and BLMI-500A modular units. Match the filter to the machine's published daily production, not to its physical size. Machines rated from 650 lbs upward step up to a larger filtration system in Blue Air's sizing chart.

The Blue Air DH-R1 replacement filtration cartridge is the matching consumable. It carries the same 21,000 gallon capacity, 0.5 micron rating, 2 GPM flow rate, 30 to 100 PSI pressure range and 35°F to 100°F temperature range as the cartridge shipped in the DH-S1, so nothing about the system's performance changes at swap time. The head, the mounting bracket and the 3/8" plumbing all stay in place.

A 0.5 micron rating means the DH-S1 captures more than 99% of particles at or above half a micron — sediment, silt, rust and scale precursors that would otherwise reach the ice machine's pump, float valve and evaporator. Alongside the particle work, the cartridge is formulated for scale reduction and for chlorine taste and odor reduction, with Blue Air rating chlorine reduction at up to 97%. The result is clearer, harder ice and a machine that holds its rated production.

The system uses 3/8" inlet and outlet connections and requires incoming water between 30 and 100 PSI at 35°F to 100°F. It flows 2 GPM at rating, with a usable service range of 0.1 to 2.0 GPM. Allow 19" of vertical space for the assembly with the cartridge installed, and fit an upstream shut-off valve so the cartridge can be changed without draining the line; the whole unit weighs only about 6 lbs in operation, so a standard wall bracket carries it.

On any hard or heavily chlorinated municipal supply, yes. Untreated water deposits scale on the evaporator plate, which lengthens harvest cycles, cuts daily ice production and eventually forces a descaling service call or a premature evaporator replacement. Chlorine carries straight through into the cube and into every drink poured over it. A DH-S1 on the inlet is inexpensive insurance against both, and most ice machine manufacturers expect filtered water as a condition of normal service life.