Swimming Pool Blog


How to Make a Pool Porta-Vac Pump

How to Make a Pool Porta-Vac Pump
by Mark Garcia April 14, 2016

Porta-Vac pool pump Hayward Powerflo MatrixBack when I was servicing a pool for a living, we used our Porta-Vac every day, to vacuum pools with poor suction, or to vacuum to waste on a filter without a multiport valve. And we also used it to start vacuuming a pool during spring opening, without waiting for the filter system to be started.

A Porta-Vac is short for Portable Vacuum, and in a nutshell, it's a pool pump with a power cord attached. Hose adapters are used to connect suction hose (vacuum hose) and discharge hose (another vac hose, or backwash hose with clamp).

If you find it nearly impossible to vacuum into your filter system because of poor suction, or you can't vacuum to waste with your slide valve or cartridge pool filter, or if you take care of several pools and want a consistent method - make a Porta-Vac pool pump!

 

MATERIALS NEEDED FOR A PORTA-VAC PUMP

  • POOL PUMP: But not just any pump, it has to have a reversible voltage motor, so that the motor wires can be switched to accept 115V (from a power cord). Most aboveground pool pumps accept 115V, and most inground pumps are reversible. 2Hp or larger inground pumps are often 230V only, and cannot be switched to accept 115V. And if the pump is too large, or too powerful, the vacuum head can become stuck to the floor. 1 hp pumps seem to work best, although a 3/4hp or 1.5hp pool pump may also be used.

  • POWER CORD: It must be a 3-prong grounded plug with 2 power leads and a green ground wire. You can find a 12/3 or 14/3 appliance plug at any home/hardware store, or you can cut off a old extension cord, and strip the wire casing back about 4 inches to expose the wires. You can buy extra protection with a power cord that has a built in GFCI, to shut off power if it senses voltage loss (grounding through you!). Go the extra step and secure the cord into the knock-out using a cable clamp connector, so the wires can't be pulled out of the motor.

    portavac made with a Hayward PowerFlo pump
  • HOSE ADAPTERS: The Hayward Hose adapter can be used, with Teflon tape to attach the hoses to the Porta-Vac. We typically cut off the smaller tip on the end of the adapter (for 1.25in hoses), but it's not necessary. We also have a 90 deg elbow hose adapter. You can also use Hard PVC on the discharge outlet of the pump. A threaded 1.5in fitting in the pump, which rises a few inches into a 90 fitting, with about a foot of PVC pipe attached. In this way you have a carry handle for the pump and in some cases may not need to attach any discharge hose.

 

QUESTIONS ABOUT PORTA-VAC PUMPS

  • Which Pool Pump should I use? Honestly, it doesn't really matter, as long as the motor is 115V or 115V/230V (reversible). Ideally it won't be too powerful like a large Whisperflo or Northstar pump. A medium head pump like the Superpump or Superflo, 1 or 1.5 hp will do nicely. It needn't be a new pool pump, it could be a used junker from Craigslist, as long as it works, it need not be pretty. Ideally, it would have a large strainer basket on the front, to keep from having to empty the basket too often, although an inline leaf strainer can be used.

  • Can aboveground pool pumps be used? Some will say that you can't - because aboveground pumps are not self-priming. That is, they are designed to be installed Below water level, and have difficulty lifting water vertically. However, If it's placed on the pool deck, less than a foot above the water level, it will catch prime, no problem.The pumps pictured on this page are both aboveground pumps, which can be purchased for around $200 - The Power-Flo Matrix or the smaller Power-Flo LX pump, shown in the video below, both make fine Porta-Vac pumps.

  • Can I use a Porta-Vac to improve filtration? Yes, indirectly - a Porta-Vac can be used to improve circulation, which will improve filtration. If you leave the vacuum pole and hose attached, and then run the discharge hose back into the pool or into the skimmer, you can improve deep end water quality, as the vac head acts like a main drain, essentially doubling your pool circulation, for faster pool clean-ups.

  • My breaker keeps tripping when I try to use the Porta-Vac? If it trips immediately, make sure that you are using a grounded plug and that the plug wires are connectly correctly to both terminals. For long extension cord runs, using a larger wire diameter cord can help. If it trips after running for few minutes, check what other electrical loads may also be using the circuit, or just find another outlet to use. Kitchen and Utility rooms often have 20A electrical outlets, while exterior outlets are typically 15A.

  • Can I make a gas powered Porta-Vac? Yes, in fact we used several Honda semi-trash pumps in the 3-5 hp range to vacuum pools that were filled with leaves, or to quickly vacuum and continue to lower the water level for winterization, while the filter was being cleaned and winterized. We outfitted the suction side with a 3in heavy duty hose connected to a 3-way Jandy valve, or Tee fitting. This allowed us to vacuum the pool without the vacuum head getting stuck to the pool, from too much suction. The discharge side of the pump had quick disconnect fittings for our heavy duty discharge hose.

  • inline leaf strainerI have a lot of large debris, will this work for me? For large debris, real messy pools, you want a pump that has a fairly large basket, or at least not small. Or, you can use an inline leaf strainer, which attaches to the end of the vacuum hose, and the other end attaches to a short 6 ft hose section, which attaches to the front of the pump. Leaf Strainers hold a lot of debris, so you can happily vacuum without stopping every 4 minutes to empty the pump basket.

  • Any precautions I should take? The largest hazard would be pulling the pump into the pool by mistake. I've never heard of that happening, but I suppose it's possible! Secondly, be careful plugging in an electric cord while you may be standing in a puddle of water. Be sure to secure the power cord into the 3/4in knockout, by using a 3/4in cable clamp, so wires can't become disconnected and ground out inside the motor.
  • How do I reverse power from 230V to 115V? First make sure that the pump has a 115V motor, or can be switched from 230V to 115V. To switch to 115V, it is necessary to move 1 or 2 wires in the back of the motor, on the terminal board where the wires connect. The pump motor label plate will have a Voltage Wiring Diagram, and you want to move a few wires in the back to match the Low Voltage diagram. Some newer motors are simply moving a switch, while others require you to move two wires to different terminals on the terminal board.

  • How do I connect the Power Cord? After confirming that the motor is ready to accept 115V, run the power cord wires through the opening at the rear of the motor, and clamp them using a cable clamp. Connect the green ground wire to the ground screw, and the 2 power leads to L1 and L2 terminals (doesn't matter which wire goes to which terminal). Add water to prime the pump and test it out!

 

VIDEO OF A PORTA-VAC PUMP

Video from Swimmingpoollearning.com - showing a Porta-Vac in Action!

 

Thanks for Reading!
Mark Garcia