Swimming Pool Blog
by Rob Cox February 26, 2019
Chemical Feed Pumps
Technically, they're called peristaltic chemical transfer pumps, but in the industry we hear them called by other names - chlorine pumps, chemical pumps, liquid feeders, to name a few, and we call them Chemical Metering Pumps, that 'meter-out' exact dosages.
Pool chemical pumps pull liquid out of 5, 15 or 50 gallon chemical vats, and pump the chemical directly into the pool return line with an injection fitting. The 3-wheel rotating roller creates continuous suction, without the need for check valves.
They are most commonly used by large commercial pools and spas, that need to deliver a constant dosage of liquid chlorine, all through the sunny day. They can also be used to pump liquid acid or base solutions, for control of pH and alkalinity levels. And when connected to a pool chemical controller, they are used together, to control ORP, or oxidation reduction potential, precisely.
CHEMICAL PUMP? WE JUST POUR IT IN THE POOL.
The best features of a liquid chemical pump is that they are available in many different sizes, pumping a maximum of 1-gal per day for spas and small pools, up to 95 GPD for the largest models. A dial allows control of how many seconds per minute the pump is running, and can be limited to operate during certain times of day.
Another great feature of using a liquid chlorine pump, is that it affords precise metering of chemical dosage. Hand feeding chlorine, or pouring liquid directly into the pool can be inaccurate, and creates peaks and valleys of chlorination, which leads to poor water conditions.
JUST FOR LARGE, COMMERCIAL POOLS?
Although I have seen a few liquid chemical feeders in residential pools, they are not a common feature on most backyard pools, as most smaller pools use chlorine tablets. But for those that like liquid chlorine (Hi, Florida!) these pumps are installed over a 5 gal. or 15 gal. drum of sodium hypochlorite (12.5% NaOCl, delivered by a local company). As mentioned earlier, pool chemical pumps are also used on pools that have a chemical controller, like a CAT controller or Hayward controller, for perfectly oxidized and pH balanced water, all the time.
However, by far the most common use of a pool chemical pump is just for liquid chlorine, without a controller. We find that commercial pools such as community pools, rec centers, resorts, hotels, schools and other natatoriums are the largest customer for our peristaltic pumps. No other method of chlorine delivery is as economical or feasible for large pools, and heavily used pool facilities.
However, many facilities do find that using a chemical controller, to precisely monitoring ORP, pH and FC levels, can result in reduced cost of chemicals overall, in addition to happier swimmers. RolaChem makes a nice Digital pH/ORP Wall Mounted System, and CAT 2000 Pro Pack Automation System is also very popular.
And now, large commercial pools are also investing in advanced forms of water treatment, such as hydroxy radicals produced by combination Ozone/UV units, such as Hayward's HydroRite UVO3 unit. Although not a standalone system, UVO3 units operate as an NSF certified secondary sanitation system, and greatly reduce the amount of chlorine needed.
ROLA-CHEM PRO CHEMICAL PUMPS
- Electronic controls for extended motor life.
- Quick release cover for fast tubing access.
- Three-way switch control for priming, shock feeding or stopping feed without disturbing your feed-rate setting.
- Includes Clear Tygon (Chlorine) and Black Norprene (Acid or Chlorine) Tubes.
- Self-priming pump.
- 30 psi rating with 18-ft. suction lift.
- Available in 120V or 240V corded or permanent wire.
- Pumps operate on 9-minute cycles.
BLUE-WHITE FLEXFLO PUMPS
- Pairs with Acu-Trol, Hayward HCC and CAT, and Rola-Chem chemical feed controllers
- Output pressures to 100 PSI
- Max Feed Rate: 3.96 GPH
- Max Pressure: 100 PSI
- Features easy-to-use dial control
- 60 Second repeating interval timer
- Housing is made of chemical-resistant Valox (PBT) thermoplastic
- Duty cycle: continuous
We also carry Hayward chemical pumps, model AC035, used with Hayward and CAT automation systems for chemical controllers. If you should decide to use liquid chemicals and a peristaltic chemical pump, you can enjoy continuous chlorination, at a low price per ppm. Liquid chemical pumps cost a few hundred dollars, but are reliable and durable units that can last many years.
If you have any specific questions about pool chemical feeders, find my email at the top of the page and ask away. If you like this post - feel free to share it on your favorite online gathering place.