The Hydro-Logic ARCS Stage 2 is the replacement heavy metal reduction cartridge that removes heavy metals for HydroLogic’s ARCS (Automated Reclaimed Condensate System) filter array. It measures 20 in x 4.5 in (H x W) and carries maker part number HGC741612 (model HL22015.4). It is the middle cartridge in the ARCS train — sitting after the sediment stage and before the pH neutralizing/remineralizing stage — and the maker’s guidance carried by its retailers is to replace it every 10,000 gallons of product water. This page gives the product facts a carrying retailer publishes, explains how a heavy-metal reduction stage works, and is honest about the specs neither the maker’s live catalog nor its retailers list.
What it is
The Hydro-Logic ARCS Stage 2 is a replacement heavy metal reduction cartridge designed to remove heavy metals as the second stage of HydroLogic’s ARCS — the Automated Reclaimed Condensate System, a multi-stage filter array. In that train, Stage 1 is a sediment cartridge, Stage 2 (this cartridge) targets heavy metals, and Stage 3 is a pH neutralizing/remineralizing cartridge. It carries maker part number HGC741612, listed under model HL22015.4. This particular listing is the “4/CS” distributor pack code; what that code maps to as a purchasable unit is held (see Honest fit). It is a replacement filter cartridge — not a housing, a pump, or the full ARCS system.
Specifications
| Type | Replacement heavy metal reduction cartridge (ARCS Stage 2) |
|---|---|
| Function | Removes heavy metals |
| Dimensions (H x W) | 20 in x 4.5 in |
| Weight | 8 lb (actual product weight; the retailer lists 13.0 lb shipping) |
| Replacement interval | Replace every 10,000 gallons of product water, or as needed |
| Part number | HGC741612 (model HL22015.4) |
| Listing pack code | “4/CS” distributor pack code — the unit it maps to is held (see Honest fit) |
Why choose the ARCS Stage 2 Heavy Metal Reduction Cartridge
- The matched replacement part. It is the replacement heavy metal reduction cartridge built for the ARCS array, carrying maker part HGC741612, so it drops into the Stage 2 housing it was designed for without adaptation.
- Dedicated heavy-metal stage. It is a stage whose job is removing heavy metals, keeping that duty off the sediment and pH stages on either side of it in the train.
- Serviceable on a gallon budget. With a published 10,000-gallon replacement interval, the cartridge gives a throughput figure you can schedule maintenance against rather than guessing.
- Sized for the ARCS housing. At 20 in x 4.5 in, it is a full-height big-bore element, giving more media volume than a standard 10 in cartridge.
Best uses
- Heavy-metal reduction in an ARCS condensate-reclaim train. As the Stage 2 cartridge, it is the metals-targeting element between the sediment stage ahead of it and the pH stage behind it, treating reclaimed condensate before it is reused.
- Scheduled cartridge replacement. Where a grower runs the ARCS array continuously, the 10,000-gallon interval lets the Stage 2 cartridge be swapped on a known cadence alongside the other stages.
- Reclaiming AC / dehumidifier condensate. The ARCS system it belongs to reclaims condensate water for reuse; this cartridge is the heavy-metal stage of that clean-up train.
How a heavy-metal reduction stage works
A dedicated metals stage in a staged filter works by passing water through a bed of media that binds dissolved metal ions to its surface — by adsorption and, for redox-active media, by chemical reduction — so metals leave the water and are retained in the media rather than passing downstream. Staging matters: putting a metals-reduction element between a sediment stage and a final polishing or pH stage means each stage handles the contaminant class it is best at — coarse particulate first so it does not blind the media behind it, then the dissolved-metal load, then the finishing step — which spreads the work and lengthens the service life of every stage. In a condensate-reclaim loop the water being treated is captured from air conditioners or dehumidifiers, which can pick up metals from coils, pans, and plumbing on the way, so a metals stage is placed in the train to bring that reclaimed water back toward usable quality. The cartridge’s finite capacity is why a throughput-based change interval exists: once the media’s binding sites approach saturation, reduction efficiency falls, which is what the maker’s 10,000-gallon replace point is there to stay ahead of.
Compatibility and care
- System fit: it is the Stage 2 replacement cartridge for HydroLogic’s ARCS (Automated Reclaimed Condensate System) array; it carries maker part HGC741612 (model HL22015.4). Confirm your ARCS Stage 2 housing accepts a 20 in x 4.5 in cartridge before ordering.
- Replacement cadence: the retailer-carried maker guidance is to replace every 10,000 gallons of product water, or as needed — sooner on high metal loads.
- Weight to plan for: the cartridge’s actual product weight is about 8 lb — a full big-bore element to lift when servicing the housing.
How it compares to a general-purpose carbon cartridge
Cartridges in a treatment train differ by the contaminant class they target and their size. This table is factual — it does not claim this cartridge out-performs any other; which stages your water needs is an operator’s decision.
| Factor | ARCS Stage 2 (this cartridge) | General-purpose carbon block |
|---|---|---|
| Primary target | Heavy metals | Chlorine, taste/odor, some organics |
| Role in the train | Dedicated ARCS Stage 2 metals stage | General pre-filter / polishing stage |
| Dimensions (H x W) | 20 in x 4.5 in | Varies; commonly 10 in nominal — match to your housing |
| Replacement interval | Every 10,000 gallons | Varies by media and water — check the maker rating |
Where it fits
For more water treatment and filtration gear, browse the filtration & RO units category. This heavy-metal stage pairs with the other elements of a filtration and RO train:
- Hydro-Logic Big Boy KDF85 Catalytic Carbon Filter — a KDF/catalytic-carbon stage that reduces chlorine and heavy metals.
- Hydro-Logic Micro 75 GPD Reverse Osmosis System — a compact RO unit for polishing treated water down to low dissolved solids.
- Hydro-Logic FlowMaster Ultra Low Flow (1/4 in) — a low-flow controller for tuning a filtration train’s feed rate.
- Dilution Solutions 1-1/2 in Filter with 200-Mesh Screen — a coarse mesh pre-screen ahead of finer stages.
Frequently asked questions
What does the ARCS Stage 2 cartridge do? It is a replacement cartridge that removes heavy metals as the second stage of the ARCS array.
What are its dimensions? It measures 20 in x 4.5 in (H x W).
How often should it be replaced? Every 10,000 gallons of product water, or as needed.
What is the part number? It carries HGC741612 (model HL22015.4).
Which specific heavy metals does it reduce, and what is its micron rating? The maker’s live catalog does not carry a product page for this cartridge, and its retailers state only that it removes heavy metals — the specific metals, media, and micron rating are not published, so they are not stated here (see Honest fit).
Who this is for — and who should skip it
Suited: growers running a HydroLogic ARCS (Automated Reclaimed Condensate System) who need the matched Stage 2 heavy metal reduction replacement cartridge on a scheduled-replacement plan.
Not for / its limits: this is a replacement filter cartridge — not a housing, a pump, or the full ARCS system, and it does not purify water on its own. It is one stage of a multi-stage train and does not remove sediment or adjust pH — those are the other ARCS stages. Confirm your Stage 2 housing accepts the 20 in x 4.5 in element before ordering.
HELD (not stated because not sourced): the maker’s product page for this cartridge returns HTTP 404 (it is not in the live maker catalog), so no value here is stamped as a maker spec — the product facts above trace to a carrying retailer (bghydro). The specific heavy metals reduced are not published on any page fetched (only “removes heavy metals”), so no metal list (zinc/copper/lead or otherwise) is stated. The filter media and composition, the micron rating, the flow-rate and maximum-pressure ratings, and any third-party certification are not published — none are stated here. The distributor “4/CS” pack code appears in this listing’s title; what it maps to as a purchasable unit is not something the maker publishes, so its interpretation is held. The retailer lists a 13.0 lb shipping weight versus an 8 lb actual product weight; the ~8 lb figure is used above and the discrepancy is disclosed here. The live retail price is the storefront price field at deploy, not set or guaranteed here; any warranty term is held per store policy and not reproduced.
Refreshing your ARCS stages? Add to cart, or talk to a grower about matching this cartridge to your ARCS housing.
Sources
- Carrying retailer (BGHydro) — product page for the Hydro-Logic ARCS Stage 2 Heavy Metal Reduction Cartridge (removes heavy metals; dimensions H x W 20 in x 4.5 in; actual product weight 8 lb, shipping 13.0 lb; replace every 10,000 gallons of product water; part number HGC741612, model HL22015.4; HTTP 200, retrieved 2026-07-08). Used because the maker’s own product page returns HTTP 404 (see below): https://www.bghydro.com/hydro-logic-arcs-stage-2-heavy-metal-reduction-cartridge.html
- Corroborating retailers (part number, 10,000-gallon interval): HydroBuilder (https://hydrobuilder.com/hydro-logic-arcs-stage-2-heavy-metal-reduction-cartridge.html) and Elevated Equipment Supply (https://elevatedequipmentsupply.com/products/arcs-stage-2-heavy-metal-reduction-cartridge-20-x-4-5), both HTTP 200, retrieved 2026-07-08.
- Manufacturer (HydroLogic Purification Systems) — the product page https://www.hydrologicsystems.com/products/arcs-stage-2-heavy-metal-reduction-cartridge-20-x-4-5 returns HTTP 404 on both the WAF-immune fetch and anonymous fetch (retrieved 2026-07-08); the cartridge is not in the maker’s live catalog, so no value on this page is stamped manufacturer-spec.
- General heavy-metal reduction and staged-filtration mechanism (universal, physics-definitional): a metals-reduction medium binds dissolved metal ions by adsorption/redox and retains them; staging contaminant classes (sediment, then dissolved metals, then finishing) spreads the load and lengthens each stage’s service life. No product-specific value is drawn from this general mechanism.
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