Based on the aggregated intelligence of 135,000-plus investors participating in Motley Fool CAPS, the Fool's free investing community, Calgon Carbon (NYSE:CCC), which makes water and air purifying systems, has earned a coveted five-star ranking.

With that in mind, let's take a closer look at Calgon's business and see what CAPS investors are saying about the stock right now.

Calgon facts

Headquarters (founded)

Pittsburgh, Pa. (1942)

Market Cap

$720.7 million

Industry

Commodity chemicals

TTM Revenue

$400.6 million

Management

CEO & President John Stanik (since 2003)
CFO Leroy Ball (since 2002)

Return on Equity (average, last three years)

8.5%

Competitors

Siemens (NYSE:SI)
Pall (NYSE:PLL)

CAPS members bullish on CCC also bullish on:

General Electric (NYSE:GE)
Vale (NYSE:VALE)

CAPS members bearish on CCC also bearish on:

Garmin (NASDAQ:GRMN)
Citigroup (NYSE:C)

Sources: Capital IQ (a division of Standard & Poor's), and Motley Fool CAPS. TTM = trailing 12 months.

Over on CAPS, 265 of the 284 members who have rated Calgon -- 93% -- believe the stock will outperform the S&P 500 going forward. These bulls include pikokiwijr and All-Star SuperCharge, who is ranked in the top 2% of our community.

Just last month, pikokiwijr made a particularly purified pitch:

Little debt. Positive earnings. People are headed green. They'll benefit.

In a pitch from a month earlier, SuperCharge made sure Calgon bulls breathed even easier. Here's an excerpt from the long pitch:

Yes, the stock is trading at a 20 P/E but it traded at 50 in 2007 for a reason ... growth and potential future booming growth. Forward P/E is 15.6 and they just received a new credit facility to help with their expansion. ... I'm still banking on the world's largest manufacturer of granular activated carbon to be trading at $20 in the not too distant future. 2-10 years down the road, the sky's the limit assuming granular activated carbon remains a valuable material in purification systems for drinking water, wastewater, odor control, pollution abatement, and a variety of industrial and commercial manufacturing processes.

What do you think about Calgon, or any other stock for that matter? Make your voice heard on Motley Fool CAPS today. More than 135,000 investors are waiting to hear what you have to say. CAPS is 100% free, so simply click here to get started.

Fool contributor Brian Pacampara owns no position in any of the companies mentioned. Garmin is a Motley Fool Global Gains pick. The Fool's disclosure policy always gets a perfect score.