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3-Stage Replacement Set — Sediment + GAC + Coconut Carbon Block, 10″ × 2.5″ (4-Year Supply)
3UF24COCONUT
8 sets · 24 cartridges
This page covers which systems the set fits, when and how to change the filters, and what to do if something doesn’t look right.
Is this your set?
Check these against the box in your hand.
- ✓24 cartridges: 8 white sediment filters, 8 granular carbon (GAC) filters and 8 black coconut carbon blocks
- ✓Each about 10″ long and 2.5″ across (the slim size)
- ✓For a system with three filter housings
Count your housings, then measure one
- Three slim housings (about 2.5″ cartridges, 3/4″ ports) — this set fits.
- Two slim housings — you need a 2-stage set. 2-stage coconut set →
- Wide Big Blue housings (about 4.5″ cartridges, 1″ ports) — these cartridges won’t seal. Big Blue sediment filter →
Systems this set fits
| Model | System |
|---|---|
| MWC-WHS34B2 | MyWaterClub 3-stage system, blue housings, premium coconut block — the same filters it came with |
| MWC-WHS342SET | MyWaterClub 3-stage system, clear housings, 3/4″ ports (also labeled WHS34SET) — an upgrade from its standard carbon block |
| WHF-34F2 | MyWaterClub 3-stage system, blue housings, 3/4″ ports (also labeled WHF-34V2) — an upgrade from its standard carbon block |
It also fits other three-housing systems, and the three pre-filter housings of most under-sink RO systems, that take standard 10″ × 2.5″ cartridges. Not sure? Send us a photo →
What’s in the box
| Stage | Cartridge | What it does |
|---|---|---|
| Stage 1 · 8 pcs first housing, water inlet |
Sediment
SED5 · 5 µm · melt-blown PP
|
Traps dirt, silt, sand and rust particles and protects the carbon filters after it |
| Stage 2 · 8 pcs second housing |
GAC — Granular Carbon
GAC-10 · granular activated carbon
|
Reduces chlorine, taste and odor |
| Stage 3 · 8 pcs third housing, toward the house |
Coconut Carbon Block
CBCO-10 · 10 µm · coconut shell
|
Final polish for chlorine taste and odor; coconut shell carbon gives the cleanest taste |
Size 10″ × 2.5″ (9⅝″ × 2.5″) · max 100 PSI · 36–100°F, cold water only
Reorder this set
This set · 3UF24COCONUT
3-Stage Set, Sediment + GAC + Coconut Carbon Block — 8 sets, 24 cartridges
The same set you have now — a 4-year supply at one change every 6 months.
Other options for a 3-stage system
- One set, sediment + GAC + coconut carbon block — the same filters, 3 pieces.
- 3-stage set with standard CTO carbon block — a lower-cost carbon block.
- Catalytic carbon cartridge — use it in place of the coconut carbon block (third housing) if your city water uses chloramine.
When to change your filters
| Component | Typical interval | Change sooner if… |
|---|---|---|
| All three cartridges | Every 6 months up to 12 months on cleaner water; as often as every 3 months on heavy sediment |
Water pressure drops, the sediment filter turns brown, or chlorine taste comes back |
| Housing O-rings | Inspect every change Replace every 12–24 months |
Cracked, flattened, brittle, or weeping at the seam |
| Filter housings | Clear: 3–4 years Blue: 4–5 years |
Any hairline cracks, cloudiness, or a leak that a new O-ring doesn’t stop |
Intervals are typical estimates. Your water chemistry, pressure, and household usage set the real schedule.
Changing your filters
- Shut off the water. Use the shutoff valves or bypass around the system if you have them; if not, close the main house shutoff.
- Open a cold tap downstream, then press the pressure-release button on each housing cap. Never open a housing under pressure.
- Put a bucket and towels underneath, then unscrew each housing with the filter wrench.
- Remove the old cartridges and rinse the housings with clean water; no soap.
- Inspect each O-ring. Seat it fully in its groove and wipe it with a thin film of food-grade silicone grease.
- Fit the new cartridges in flow order: sediment in the first housing (water inlet), GAC in the second, coconut carbon block in the third. Reversed, the carbon clogs early.
- Hand-tighten each housing, then snug it with the wrench. Don’t overtighten.
- Turn the water back on slowly, press the release buttons to let the air out, and check for leaks now and again after 12 hours.
- Run a cold tap for a few minutes to flush. Some black carbon fines at first are normal.
- Write the date next to the set number in the booklet that came with the set — it has a line for each of the 8 sets.
Common questions
| What you’re seeing | Most likely cause |
|---|---|
| Water pressure has dropped | The sediment filter is full. Change filters sooner on dirty or well water. |
| Leak where a housing meets the cap | O-ring twisted, dry or out of its groove. Release pressure, reseat and lightly grease it, re-tighten. |
| Black specks after a change | Carbon fines from the new carbon filters. Keep flushing a few more minutes. |
| Chlorine taste or odor comes back | The carbon is used up. Change all three cartridges, or at least the GAC and the carbon block. |
| Still smells of chlorine right after a change | Your city may use chloramine, which carbon block doesn’t reduce. Use a catalytic carbon cartridge in place of the coconut carbon block, in the third housing. |
| Housing won’t unscrew | Pressure is still in the system. Turn off the supply, press the release button, then use the wrench. |
| The cartridge won’t fit or seal | Your housings may be Big Blue (4.5″ wide). This set is for slim 2.5″ housings. |
Need help?
Call or text (858) 345-7345. Bought on Amazon? You can also reach us through Amazon: Your Orders › Contact seller.
Scope note: This set reduces sediment particles and chlorine, taste and odor. It does not reduce chloramine, hardness or dissolved minerals, and it is not a certified microbiological purifier. Do not use it to make microbiologically unsafe water safe to drink.
Please note: Filter life and reduction performance depend on your water chemistry, pressure, and usage, so results vary from home to home. This product is not certified to treat water of unknown quality and is not a substitute for testing your water. Descriptions use general, qualified language and are not health claims.