Omnipure - K5686 - 12" x 2.5" GAC With Phosphate Inline Filter - Isopure Water - K5686 - BB
Omnipure - K5640 - 12" x 2.5" T40 GAC Coconut Carbon Inline Filter - Isopure Water - 2x K5640 - BB
Omnipure - K5686 - 12" x 2.5" GAC With Phosphate Inline Filter - Isopure Water - 3xK5686 - BB
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Omnipure

Omnipure - K5686 - 12" x 2.5" GAC With Phosphate Inline Filter

Product Code K5686-BB

$23.85
Special order — arriving October 11, 2026

Not in stock today. Order now to reserve one from the incoming shipment — your card is charged at checkout to hold it, and we ship as soon as it arrives. Cancel free any time before it ships.

Special order — expected in stock October 11, 2026

This item is not currently in stock. It is on order and we expect it in our warehouse on or around October 11, 2026. Ordering now reserves a unit from that incoming shipment — we ship within one to two business days of it arriving.

Charged at checkout to reserve your unit
Cancel free before it ships
We email you if the date moves

To cancel for a full refund, email support@isopurewater.com or call 714-541-6600 any time before the item ships. Credit card refunds are issued within one billing cycle. If we learn we can’t ship by the date above, we’ll email you a revised shipping date and the option to cancel.

The Omnipure K5686 is a 12" x 2.5" inline filter combining granulated activated carbon with polyphosphate scale inhibitor to remove chlorine taste, odor, and particulates while preventing lime and scale buildup. Available with multiple fitting options including 1/4" NPT, 3/8" NPT, 1/4" QC, and 3/8" FQC for easy installation in refrigerators, ice makers, RO systems, and beverage equipment.
SPECIFICATIONS

K5686 Filter Specifications

Dimensions
12" x 2.5"
Standard inline size
Flow Rate
0.5 GPM
Optimal performance rate
Service Life
2000 Gallons
Or 6 months
Media Volume
35.5 cu. in.
GAC + Polyphosphate
Max Pressure
125 PSI
Residential standard
Max Temperature
100°F
Cold water rated
TECHNICAL DETAILS

Filtration Media & Reduction

Filtration Media Granulated Activated Carbon with Polyphosphate Scale Inhibitor
Reduces Chlorine Chlorine taste and odor
Reduces Particulates Class 1 particulate reduction
Scale Inhibition Polyphosphate prevents lime and scale buildup
Fitting Options 1/4" NPT, 3/8" NPT, 1/4" QC, 3/8" FQC
Model Variants K5686-BB, K5686-CC, K5686-JJ, K5686-KK
NSF Classification Class 1 particulate reduction certified
COMPATIBILITY & APPLICATIONS

Where to Use the K5686

The Omnipure K5686 inline filter installs in refrigerators, ice makers, beverage equipment, drinking fountains, under-counter filtration systems, and as a post-filter in reverse osmosis systems. The dual-action carbon and polyphosphate formula makes this filter ideal for applications where both taste improvement and scale prevention are needed. Quick-connect and NPT thread options ensure compatibility with most residential and light commercial plumbing configurations. Note that NPT fittings measure larger than their nominal size: 1/4" NPT measures approximately 0.540" in actual diameter, and 3/8" NPT measures approximately 0.675" when measured with a ruler.

💧 Replace the K5686 every six months or 2000 gallons to maintain effective chlorine reduction and scale inhibition. The polyphosphate media prevents hard water deposits from forming on ice maker evaporators and beverage equipment heating elements.