We’re standing here with Scott, he is the product manager for Hayward’s pump division. Now, let’s go with a big question, why would you want to go with variable speed?
After my last article on how to calculate the total dynamic head (TDH) of your swimming pool, I decided to tackle a subject in a similar realm: high and medium head pumps. In the Total Dynamic Head (TDH) blog post we explained that TDH is essentially the force/resistance working against the pump as it pushes water through your pipes. The higher the feet of head, the harder your pump needs to push to counteract that resistance.
Calculate your feet of head according to the blog post or your choice of online calculator and select the style of pump accordingly:
- Medium Head Pump < 65 Feet of Head
- High Head Pump > 65 Feet of Head
Hello Inyo Fans and pool owners, we have a special treat in store for you this pool season. Matt and Rob are unveiling Inyo’s Pool Equipment Selection Series where we show you the correct way to size your pool equipment. The guys will guide you through how to select the right pool pump, filter, heater, sanitizers, lights, and MORE. Along with sizing, we’ll also explain and demonstrate how parts of your system work. Read the article below the video, for extra information and links.
But enough with the intro, let’s gets to show started with the first topic in our Pool Equipment Selection Series, Pumps. Take it away guys…
OK, riddle me this, you’re standing in a pool store’s showroom and you’re in awe of all the shiny new pumps. You finally make your decision on the model you want and have a hunch it will work well in your 20 000-gallon pool, but the salesperson drops a bomb on your plans by asking the simple question, “What is your feet of head?” Wait a minute, what? My head is about 10 inches. but I’ve never actually measured my own skull…
Total Dynamic Head (TDH) refers to the total equivalent height that a fluid will be pumped by taking into consideration any friction losses in the pipe. Essentially “dynamic head” is the measurement of resistance working against your pool pump as it pulls water from your basin and pushes it back to the pool. The total sum of the pipes’ lengths, rise in elevation and addition of 45-degree /90-degree turns will affect the feet of head number. All the aforementioned plumbing quirks add up to more friction the water accrues as it travels. The more friction, the harder the pump must work to push the water through the pipe, which demands that you go to a higher HP or use a larger pipe. If you need to install a new pump or replace your filter, you need to calculate the system’s feet of head to determine the best fit. A pump’s flow rate is dependent on the feet of head.