In brief: 22-inch Pentair Cristal-Flo II sand filter, model CF1122. Filter area of 2.6 sq. ft., 250 lb sand capacity, 60 GPM flow rate, 1.5-inch 6-position multiport valve included. One-piece molded polyethylene tank. Pentair part number 145361.
The most common size for a residential pool
With a flow rate of 60 GPM and 250 lb of sand, the 22-inch Cristal-Flo II is suitable for most inground and above-ground pools equipped with a medium-power pump.
The tank is molded from polyethylene in one piece: there is no seam halfway up the tank, so there is no risk of leaks there. The six-position multiport valve mounts on top and provides access to filter, backwash, rinse, recirculate, drain, and closed settings.
Official Pentair specifications
| Part number |
145361 |
| Model |
CF1122 |
| Tank diameter |
22 in. |
| Filter area |
2.6 sq. ft. |
| Sand capacity |
250 lb |
| Maximum flow rate |
60 GPM |
| Turnover capacity |
28,800 gal in 8 h |
| Maximum water temperature |
95 °F (35 °C) |
| Valve |
Included: 1.5-in. 6-position multiport |
| Tank |
One-piece molded polyethylene |
| Recommended media |
#20 silica sand, white quartz, 0.40 to 0.55 mm, uniformity coefficient ≤ 1.75 |
Source: Cristal-Flo II brochure published by Pentair.
A note about maximum pressure
Pentair's brochure lists 50 psi for the 24- and 26-inch models and 35 psi for models 20 inches and smaller. The 22-inch model falls into neither category, and Pentair does not publish a separate value for it. We'd rather say so than make up a number: refer to your filter's nameplate for the maximum operating pressure.
Regarding unions: Pentair does not publicly document which part numbers are supplied with or without unions. The union kit is sold separately under number 150119 for a 1.5-inch valve.
Frequently asked questions
Which pump is suitable for this filter?
A pump with a filtration flow rate no higher than 60 GPM. A variable-speed pump elegantly solves the problem: it can run below this threshold for filtration and only reach it for backwashing.
What sand should I buy, and how much?
250 lb of #20 silica sand in white quartz, 0.40 to 0.55 mm. That's five 50 lb bags. Confirm the capacity on your filter's nameplate before buying.
When should I backwash?
When the pressure rises about 8 to 10 psi above the starting pressure, measured with a clean filter. Record this baseline when you open the pool.
Which replacement valve?
The 1.5-inch Hi-Flow 6-way multiport valve has Pentair part number 262506. The clamp is part 152165, and the pressure gauge is part 190059.
Installation and service on the North Shore
Piscines Geyser sells, installs, and services Pentair filters in Blainville and throughout the Laurentians.
