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Editorial composition of a single Culligan CTM top-mount commercial filter: a tall cream/tan fibreglass-reinforced tank with a black top-mounted piston-valve control head, a white Smart Controller box mounted beside the valve, a black moulded base ring, and the vertical Culligan script wordmark on the tank body. A compact text block anchored to the top-left carries the headline "10-micron depth filtration", with "10-micron" picked out in cyan, and the subtitle "Top-mounted piston valve".
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CulliganUSUnited States

Culligan Top Mount (CTM) Depth Filter

Top-mounted piston-valve depth filtration for turbidity and suspended-solids reduction in commercial and industrial water systems.

MarketsSG · MY · ID
NSF/ANSI 61NSF/ANSI 372

Key specifications

Control
Top-mounted piston valve — Culligan Smart Controller; backwash initiated by time clock, flow meter, or differential pressure
Filtration rating
10-micron effluent (depth filter)
Design water-quality limits
Turbidity 5 NTU max · Chlorine 1 mg/L max · Iron 5 mg/L max
Model range
CTM-DF21 to CTM-DF36 (4 tank sizes)
Flow range
24–71 gpm normal service flow; 36–107 gpm peak (across CTM-DF21–DF36)
Configuration
Single or multiple tank configurations available
ApplicationsCommercialIndustrial
Request a QuoteRequest Technical Documentation
Technical overview

Top-Mount Depth Filtration — CTM Series

The Culligan Top Mount (CTM) depth filters use a top-mounted piston-valve control operated by a Culligan Smart Controller, with an integrated flow meter, vacuum breaker and pressure relief valve. Backwash can be initiated by time clock, flow meter or differential pressure, and depth filters are capable of 10-micron effluent water quality. The family is available in four tank sizes, in single or multiple tank configurations.

System specifications (all models)

Power
120 V, 50/60 Hz (120 V/24 V CUL/UL-listed transformer included)
Vacuum
None — FRP tank warranty is void if subject to vacuum
Warranty
2-year limited (material, workmanship, corrosion); tanks 5 years
Optional features
1.5″ or 2″ flow adapters; patented Progressive Flow; differential pressure switch and pressure gauge packages; Remote Display; RS232, RS485, Modbus PLC output
Service flow basis
Normal: 10 gpm/ft² (24 m³/hr/m²), recommended for suspended solids up to 20 ppm. Peak: 15 gpm/ft² (37 m³/hr/m²), recommended for suspended solids up to 10 ppm. Based on a 2″ flow adapter; may be slightly lower with a 1.5″ adapter
Feed water temperature
40–120°F / 4–49°C
Inlet pressure (dynamic)
35–125 psig / 240–860 kPa

CTM-DF21

Pipe size
1.5″ & 2″
Tank size
21 × 62 in (533 × 1575 mm)
Backwash flow
30 gpm (114 lpm)
Media quantity
615 lb (280 kg)
Peak service flow
36 gpm @ 10 psi (136.3 lpm @ 69 kPa)
Normal service flow
24 gpm @ 5 psi (90.8 lpm @ 34.5 kPa)

CTM-DF24

Pipe size
1.5″ & 2″
Tank size
24 × 72 in (610 × 1829 mm)
Backwash flow
48 gpm (182 lpm)
Media quantity
870 lb (395 kg)
Peak service flow
48 gpm @ 9 psi (182 lpm @ 62 kPa)
Normal service flow
32 gpm @ 5 psi (121 lpm @ 34.5 kPa)

CTM-DF30

Pipe size
1.5″ & 2″
Tank size
30 × 72 in (762 × 1829 mm)
Backwash flow
70 gpm (265 lpm)
Media quantity
1,230 lb (558 kg)
Peak service flow
74 gpm @ 11 psi (280 lpm @ 76 kPa)
Normal service flow
50 gpm @ 7 psi (190 lpm @ 48.3 kPa)

CTM-DF36

Pipe size
1.5″ & 2″
Tank size
36 × 72 in (914 × 1829 mm)
Backwash flow
90 gpm (341 lpm)
Media quantity
1,895 lb (859 kg)
Peak service flow
107 gpm @ 19 psi (405 lpm @ 131 kPa)
Normal service flow
71 gpm @ 10 psi (269 lpm @ 69 kPa)

Best for

Commercial and industrial depth filtration across the markets Culligan lists, including clinics, educational facilities, food and beverage production, food service, grocery, healthcare, hospitality, manufacturing, municipal drinking water, and oil and gasFeed water within the design limits: turbidity 5 NTU max, chlorine 1 mg/L max, iron 5 mg/L max

Key product advantages

  • Piston-valve technology with retained, radial seals in the body — intended for challenging water conditions
  • Integrated flow meter, vacuum breaker and pressure relief valve
  • Culligan Smart Controller with telemetric data capability and remote monitoring
  • Backwash initiation by time clock, flow meter or differential pressure inputs
  • No special tools required for servicing
  • Single or multiple tank configurations available
Product story

A closer look

Editorial composition of a single Culligan CTM top-mount commercial filter: a tall cream/tan fibreglass-reinforced tank with a black top-mounted piston-valve control head, a white Smart Controller box mounted beside the valve, a black moulded base ring, and the vertical Culligan script wordmark on the tank body. A compact text block anchored to the top-left carries the headline "10-micron depth filtration", with "10-micron" picked out in cyan, and the subtitle "Top-mounted piston valve".
Editorial composition of the black top-mounted piston-valve control head of a Culligan CTM filter, showing the ribbed valve body with side port connections, the Culligan wordmark on the valve collar, and the white Smart Controller box with a blue faceplate and keypad mounted alongside, with the cream/tan tank shoulder visible below. A compact text block anchored to the bottom-left carries the headline "Piston-valve control head" and the subtitle "Time clock · flow meter · ΔP-initiated backwash".
Editorial composition of a single Culligan CTM top-mount filter tank installed as the first unit in a plant-room treatment line, connected by grey pipework and standing ahead of a downstream stainless-steel membrane skid with pressure vessels, pumps and a control cabinet. A compact text block anchored to the bottom-left carries the headline "Pretreatment role" and the subtitle "Ahead of the softener, RO, or DI train".
Editorial composition of a single Culligan CTM top-mount filter tank installed against the wall of a clean commercial utility corridor, connected to stainless-steel pipework with an isolation valve, with a floor drainage channel alongside and back-of-house equipment visible beyond. A compact text block anchored to the bottom-left carries the headline "Commercial & institutional" and the subtitle "F&B · hospitality · healthcare".
Editorial composition of a technical illustration of a Culligan CTM filter shown in external silhouette on a dark background, with cyan flow-direction arrows at the valve body indicating the service-flow and backwash-flow paths through the top-mounted valve. The tank interior is not depicted. A compact text block anchored to the top-left carries the headline "Selectable backwash" and the subtitle "Time clock, flow meter, or ΔP input".
Editorial composition of a single Culligan CTM filter tank on a dark teal background, with the headline “Built for real feed water” and the subtitle “Rated to 5 NTU turbidity · 1 mg/L chlorine · 5 mg/L iron”, the numeric limits picked out in cyan.
Infographic stating a filtration rating of 10 microns effluent for the depth filter, with the supporting line "Depth filtration · effluent water quality", in cyan and white text on a dark ink background.
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