Sediment cartridges
Pentair Pentek DGD-2501-20 Big Blue Dual Gradient Sediment Filter, 20 Inch: published specifications
Quick answer
The Pentair Pentek DGD-2501-20 Big Blue Dual Gradient Sediment Filter, 20 Inch publishes 3 specifications and currently lists at $42.48. micron rating 25 to 1, cartridge size 4.5 x 20 in, cartridge type Dual gradient. Every figure below is the manufacturer own, and nothing on this page is estimated.
The finer dual gradient, stepping 25 micron to 1 micron, for water that has already had the coarse material taken out.
This sheet exists because comparing two pieces of water treatment equipment usually means opening two listings in two tabs and reading past the marketing. Everything Pentair publishes for this unit is in one table below, followed by the same figures for the nearest alternatives in its category.
Published specifications
Pentair publishes 3 figures for the Pentair Pentek DGD-2501-20 Big Blue Dual Gradient Sediment Filter, 20 Inch.
Published figure A published standard, regulatory limit, unit conversion or manufacturer specification. It does not change because somebody disagrees with it.
| Specification | Value |
|---|---|
| Micron rating | 25 to 1 |
| Cartridge size | 4.5 x 20 in |
| Cartridge type | Dual gradient |
What the manufacturer says
The listing bullets below are the manufacturer own words, reproduced rather than paraphrased so that anything claimed here can be attributed to them rather than to us. Marketing language in this category is unusually loose, and a claim that a unit is certified is worth checking against a standard number and a specific claim.
These are Pentair own claims for the Pentair Pentek DGD-2501-20 Big Blue Dual Gradient Sediment Filter, 20 Inch, quoted rather than rewritten.
Published figure A published standard, regulatory limit, unit conversion or manufacturer specification. It does not change because somebody disagrees with it.
| Manufacturer claim |
|---|
| KEEP YOUR WATER CLEANER - Reduces dirt, sand, silt, and rust particles to help protect your appliances, water heater, and plumbing; spun from 100% pure polypropylene that will not impart taste, odor, or color to your water. |
| IDEAL HIGH-FLOW PRE-FILTER - Dual-gradient density traps coarse particles on the outer surface and fine particles toward the core, delivering up to 3X the dirt-holding capacity of similar-size sediment cartridges with very low pressure drop. |
| TESTED AND CERTIFIED - Rated at a nominal 1 micron and tested and certified by NSF International to NSF/ANSI Standard 42 for material requirements; polypropylene construction gives excellent chemical compatibility. |
| SIZED FOR BIG BLUE HOUSINGS - Measures 20" x 4.5" and fits all 20-inch Pentair Pentek Big Blue and other heavy-duty housings; drops in to replace any 20" x 4.5" sediment cartridge. |
| REPLACE EVERY 6 MONTHS - Change about every 6 months, or sooner when you notice a drop in water pressure or water quality; low initial pressure drop under 1 psi at 20 gpm keeps flow high. |
Against the nearest alternatives
The closest products by price in the same category, with the same published figures side by side. A cell reading "not published" means that maker does not state the figure, which is frequently the most useful thing on the row.
| Specification | Pentair Pentek DGD-2501-20 Big Blue Dual Gradient Sediment Filter, 20 Inch | Pentair Pentek ECP20-20BB Big Blue Pleated Sediment Filter, 20 Inch, 20 Micron | Pentair Pentek DGD-5005-20 Big Blue Dual Gradient Sediment Filter, 20 Inch | Pentair Pentek R50-BB Big Blue Pleated Sediment Filter, 10 by 4.5 Inch, 2 Pack |
|---|---|---|---|---|
| Price | $42.48 | $46.55 | $36.12 | $32.44 |
| Micron rating | 25 to 1 | 20 micron | 50 to 5 | not published |
| Cartridge size | 4.5 x 20 in | 4.5 x 20 in | 4.5 x 20 in | 4.5 x 10 in |
| Cartridge type | Dual gradient | Pleated | Dual gradient | Pleated |
| Washable | not published | not published | not published | Yes |
Every figure above is the manufacturer own published specification. Where a maker does not publish a figure the cell reads "not published" rather than carrying an estimate. A blank in a certification row is the finding rather than a gap: a certification covers a specific claim under a specific standard, so a system with no standard number stated has not necessarily been tested for anything you are buying it to do.
What is not on this page
Anything Pentair does not publish. We do not estimate a missing figure, interpolate one from a neighbouring model, or repeat a number from a forum. In this category the specifications are certified capacities and contaminant claims, and a reader comparing two products on a grid cannot tell a published certification from an estimate, so an estimate that reads as a certification is a safety problem rather than a gap.
In particular, no row on this page asserts what this unit removes unless the manufacturer states a certification and a standard number. A certification covers specific claims rather than the whole unit, so "certified" with no standard number attached is not a reduction claim and is not treated as one here.
If a figure you need is missing, it is missing from the manufacturer own listing, and the place to find it is the product manual or the maker technical support rather than any third party table.
Frequently asked questions
What are the Pentair Pentek DGD-2501-20 Big Blue Dual Gradient Sediment Filter, 20 Inch specifications?
Pentair publishes 3 figures for this unit: micron rating 25 to 1, cartridge size 4.5 x 20 in, cartridge type Dual gradient. Everything in the table above comes from the manufacturer own listing rather than from measurement or estimation, and anything the maker does not publish is left out rather than guessed at.
How much does the Pentair Pentek DGD-2501-20 Big Blue Dual Gradient Sediment Filter, 20 Inch cost?
It currently lists at $42.48, though prices in this category move constantly and the figure on the product page is the one that governs. Where two products are close on price, the specification table above is usually a better guide to which is right for your water than the difference between them.
Are these figures measured or published?
Published. Every number on this page comes from the Pentair listing for this exact unit. We do not test equipment in person and we never claim to, and nothing here has been derived, interpolated or rounded from another model. That is also why some rows in the comparison table read "not published" rather than carrying a number.
Does this tell me what the unit removes?
Only where the manufacturer states a certification and a standard number. A certification covers specific claims rather than the whole unit, so NSF/ANSI 42 is aesthetic effects, 53 is health effects claim by claim, 58 is reverse osmosis and 372 is the lead content of the fitting rather than lead removal. Match the claim to your own laboratory result.
Is this the current model?
It is the unit at this listing, which is the most reliable way to identify a specific product in a category where model names get reused across generations. Manufacturers frequently sell several generations alongside each other, so check the model number in the title against the one you are comparing rather than relying on the family name.
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Researched, not professional advice. This page is compiled from published standards, regulatory limits, manufacturer specifications and owner-review consensus, not hands-on testing. Nothing here diagnoses a water problem or says any product makes water safe to drink. Figures described as a rule of thumb are water treatment trade convention rather than published standards, and they are labeled that way wherever they appear. Test your water before you buy equipment: on city water start with the Consumer Confidence Report your utility publishes each year, and on a private well only a certified laboratory test tells you what you have. Bacteria, nitrate, lead, arsenic and PFAS are not do it yourself topics, they are invisible and tasteless, and they need a laboratory and usually a licensed professional rather than a product. Remember that a certification covers a specific claim under a specific standard, so "NSF certified" with no number attached tells you very little.