• Boyd Chemi-pure 5 oz original filter media jar with carbon and ion-exchange resin
  • Chemi-pure 10 oz original formula filter media jar, treats 50 gallons
  • Grande Chemi-pure 40 oz original formula filter media jar, treats 200 gallons
  • Sku: CP05
  • Vendor: Boyd Enterprises

Chemi-pure

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Size: 5 oz

Product description

Boyd Chemi-pure is the original all-in-one filter media that has kept aquariums crystal clear for over 60 years. It blends premium pelletized activated carbon with ion-exchange resin in a ready-to-use nylon bag, pulling dissolved organics, heavy metals, copper, and phenols out of the water while holding pH steady and constant. It is safe in freshwater, saltwater, and reef tanks, and is a long-time favorite for African cichlids and Discus. Browse the rest of our filter media and cartridges.

Carbon plus resin in one bag. Every size is built on QuickWash Carbon, a 0.08mm extruded pelletized activated carbon with 30 percent more surface area than the original grade. It comes pre-washed, so it rinses clear fast and gets to work right away.

How It Works

Chemi-pure acts as a chemical absorption filter, ion generator, and exchange unit all at once. The activated carbon adsorbs dissolved organics, odors, and discoloration, while the ion-exchange resin removes toxic heavy metals like copper and stabilizes pH. Because it does not strip beneficial trace elements, it is gentle enough for reef tanks yet powerful enough to keep large freshwater systems sparkling. Drop the sealed bag into your filter, sump, or canister and replace it about every four months.

Features – All Sizes

Carbon + ion-exchange resinOne bag combines premium activated carbon and resin for clarity and water quality.
QuickWash CarbonPre-washed pelletized carbon with 30 percent more surface area and far less dust.
Rock-steady pHHolds pH in the safe range, perfect for African cichlids and Discus.
Removes toxic elementsPulls out copper, phenol, dissolved organics, and discoloration.
Keeps trace elementsDoes not strip beneficial trace elements, so it is reef-safe.
Crystal clear waterSparkling, odor-free, blue-white clarity that is easy to maintain.
Fresh, salt & reefWorks in every aquarium type, from nano tanks to large systems.
Ready to useComes sealed in a nylon bag, no rinsing or measuring required.

Choose Your Size – Size Comparison

Select a size in the tab section below for the full spec sheet.

Spec 5 oz 10 oz 40 oz Grande
Treats Up To 25 gallons 50 gallons 200 gallons
Net Weight 5 oz (141 g) 10 oz (283 g) 40 oz (1134 g)
Unit Size Half unit One full unit Bulk Grande
Best For Nano & small tanks Standard tanks Large tanks & sumps
Replace Every ~4 months ~4 months ~4 months
SKU CP05 CP10 CP40

Detailed Size Specifications

Click a size below to view its full specification sheet.

5 oz · Half Unit · Treats 25 Gallons

The compact half unit is sized for nano builds, quarantine tanks, and small community aquariums up to 25 gallons. It is the easy way to keep a desktop or bedroom tank clear without overdosing a small water volume.

Specification Value
SKU CP05
Treats Up To 25 gallons (95 L)
Net Weight 5 oz (141 g)
Unit Size One half unit
Media QuickWash Carbon + ion-exchange resin
Water Types Freshwater, saltwater, reef
Replace Every About 4 months

10 oz · One Full Unit · Treats 50 Gallons

The full unit is the go-to size for standard community, cichlid, and reef tanks up to 50 gallons. It is the most popular size for everyday hobbyists who want set-and-forget clarity.

Specification Value
SKU CP10
Treats Up To 50 gallons (190 L)
Net Weight 10 oz (283 g)
Unit Size One full unit
Media QuickWash Carbon + ion-exchange resin
Water Types Freshwater, saltwater, reef
Replace Every About 4 months

40 oz Grande · Bulk · Treats 200 Gallons

The Grande bulk jar covers large display tanks, heavily stocked systems, and sumps up to 200 gallons. Split it across multiple media bags or fill a large reactor chamber for the best value per ounce.

Specification Value
SKU CP40
Treats Up To 200 gallons (757 L)
Net Weight 40 oz (1134 g)
Unit Size Bulk Grande jar
Media QuickWash Carbon + ion-exchange resin
Water Types Freshwater, saltwater, reef
Replace Every About 4 months

Which Size Is Right for You?

5 oz covers nano tanks, quarantine setups, and small community aquariums up to 25 gallons.

10 oz is the everyday choice for standard 30 to 50 gallon community, cichlid, and reef tanks.

40 oz Grande is the best value for large display tanks, sumps, and multi-tank fish rooms up to 200 gallons.

Chemi-pure or Chemi-pure Elite?

Original Chemi-pure focuses on carbon and resin for water clarity, heavy-metal removal, and stable pH. If you also need active phosphate and silicate control to starve nuisance algae, step up to Chemi-pure Elite, which adds GFO to the same proven blend.

FAQ

Is Chemi-pure reef-safe?
Yes. It removes toxins and discoloration without stripping the beneficial trace elements your corals and invertebrates rely on.

How often should I replace it?
Plan on a fresh bag about every four months, or sooner in a heavily stocked tank.

Where do I put it?
Place the sealed nylon bag anywhere with good water flow: a hang-on-back filter, canister tray, or sump. The more flow through the bag, the better it works.

Do I need to rinse it first?
A quick rinse under tap water clears any fine dust, but the QuickWash Carbon comes pre-washed so it rinses clear in seconds.

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Chemi-pure

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