Yes. Our 6 GPM whole-house nitrate system (10x54 tank, 1.5 cu ft), our 10 GPM system (13x54 tank, 2.5 cu ft), and our Fleck 5600SXT nitrate filter (10x54, 1.5 cu ft) all ship loaded with this exact resin, ResinTech SIR-100-HP. This bag exists so owners of those systems can rebed them when the resin ages out, and so DIY builders can load their own tank with the same WQA Gold Seal certified nitrate-selective media instead of guessing at bulk resin quality.

Yes, and that's the big difference from single-use media like PFAS resin. SIR-100-HP regenerates with a sodium chloride brine: ordinary water softener salt. Use a salt dose greater than 10 lbs per cubic foot with at least 30 minutes of brine contact time. Each regeneration flushes the captured nitrate to the drain and restores the bed to chloride form, so the resin works for years before it finally needs replacement. One important detail: on hard water, make the brine with softened or low-hardness water, or calcium carbonate scale will build up in the brine system over time.

Generic type 1 and type 2 anion resins prefer sulfate over nitrate. Once those beds load up with sulfate, they can release previously captured nitrate back into the water, sometimes at levels higher than the well itself, with no warning. SIR-100-HP uses a different amine functional group engineered to prefer nitrate: there is no nitrate dumping, even past the sulfate break. The reduced sulfate affinity also gives it higher operating capacity and lower leakage than conventional anion resin. For a contaminant whose main risk is to infants, that failure mode is the whole reason to pay for the selective resin.

A 10" x 54" tank (our 6 GPM nitrate system and the Fleck 5600SXT nitrate filter) holds 1.5 cubic feet, so a full rebed takes two of these 1 cubic foot bags with media left over. A 13" x 54" tank (our 10 GPM system) holds 2.5 cubic feet: three bags with media left over. Keep a minimum bed depth of 24 inches and leave room for 25-50% backwash expansion. If you're not sure what your tank holds, call or text us the model or the diameter and height and we will tell you.

Years, because it regenerates instead of being consumed. The bed restores itself with every salt regeneration; what eventually ends its life is physical wear on the beads from years of cycling. The sign it's time to rebed is treated-water nitrate creeping up between regenerations even though the salt and settings haven't changed. An annual lab test on the treated water is the reliable way to catch that, since nitrate has no taste, color, or smell.

Nitrite, which is captured by the same anion exchange process, and perchlorate, which the resin also has strong affinity for. The HP designation means the lot is WQA Gold Seal certified for potable water use. It is not a hardness, iron, or PFAS media: those need their own dedicated treatment steps.

Sulfate competes for capacity on any anion resin. SIR-100-HP is engineered so it will not dump captured nitrate even after the sulfate break, which is its key safety property, but high sulfate still reduces working capacity and means more frequent regenerations. If your lab report shows elevated sulfate, call us with the numbers and we will confirm the right resin volume and regeneration settings for your water.

Size for 1 to 4 gallons per minute per cubic foot of resin. Slower flow within that range gives more contact time and better nitrate capture. Keep at least 24 inches of bed depth. A 1.5 cubic foot bed comfortably supports a 6 GPM whole-house service flow, and a 2.5 cubic foot bed supports 10 GPM, which is exactly how our two nitrate systems are configured.

Yes. Sediment will foul the bed, iron will coat the beads, and hardness should be removed by a water softener upstream, both to protect the resin and to keep the brine makeup water soft. The standard well water treatment order is sediment, then iron filter, then acid neutralizer, then softener, then the nitrate system. Send us your water test and we will lay out the right order for your situation.