General Ecology Seagull IV Select X2-PB
A NSF-certified under-sink filter that is certified to reduce 4 contaminants, including lead at about 7.3¢ per gallon.
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You want strong contaminant reduction at the kitchen tap without a countertop unit, and are comfortable with a simple under-cabinet install.
Certified to reduce Lead — the contaminants that matter most for health.
Like most carbon filters, it does not remove fluoride — only reverse osmosis does that.
What is under-sink filter? A carbon-based cartridge (or set of stages) plumbed under your kitchen sink that filters the cold drinking-water line. Compare all filter types →
What it costs to own
| Upfront price | Check on Amazon → |
| Replacement filter (PB-2SG) | $145.53Buy refill → |
| Estimated yearly cost (filters, ~1.5×/yr) | ~$218/yr |
| True cost per gallon | 7.3¢ |
Cost per gallon and yearly cost are our estimates from the rated capacity and current prices. The filter only works if you replace it on schedule.
What it's certified to remove
Certification is per-contaminant: the General Ecology Seagull IV Select X2-PB is credited only for the contaminants listed here, verified by NSF. It does not imply removal of anything not listed.
✓ Verify this certification on the official NSF listing →
Full specifications
| Certified by | NSF |
| NSF/ANSI standards | 42 — reduces taste, odor, and chlorine (aesthetic standard) · 53 — certified for health contaminants such as lead, VOCs, and cysts |
| Filter type | Under-sink filter |
| Rated capacity | 2,000 gallons |
| Flow rate | 2 gpm |
| Replacement element | PB-2SG |
| Installation | Mounts under the sink; connects to the cold line. Basic DIY. |
Frequently asked
Is the General Ecology Seagull IV Select X2-PB NSF certified?
Yes — the General Ecology Seagull IV Select X2-PB is listed in the NSF certified-product database under NSF/ANSI standards 42, 53. That means an independent body verified its claims (not just "tested to" a standard).
Does the General Ecology Seagull IV Select X2-PB remove lead?
Yes. It is certified to reduce Lead, plus 3 other contaminants. Certification is per-contaminant, so it is only credited for what is on its listed claim set.
What does the General Ecology Seagull IV Select X2-PB remove?
It is certified to reduce 4 contaminants: Chlorine / chloramine, Cryptosporidium, Giardia, Lead.
How much does the General Ecology Seagull IV Select X2-PB cost per gallon?
About 7.3¢ per gallon, based on its rated capacity of 2,000 gallons and current price.
How often do you replace the under-sink filter?
A under-sink filter like this is typically replaced about 2 time a year (replacement element PB-2SG). Replace on schedule — a spent cartridge stops reducing contaminants.
Compare similar under-sink filters
Source: NSF public certification listing. Specs and certified claims are from the official listing; cost figures are our estimates. Some links are affiliate links — see our disclosure.