I solved my problem with a German made electronic anti-scaler.
Water in Round Rock TX has a hardness of 11 grains per gallon average, which is considered hard according to USGS standards. Hard water scale in pipes will surely occur in the long run, but problems with your sprinkler valves due to calcium scale are absolutely common in this area mainly because of high evaporation in the outdoor summer heat. Hard water will also cause common ice maker and dish washer related issues. I always say preventive maintenance is an owners choice. I personally dislike dealing with calcium deposits around my faucets, showers and sinks, but above all, the thing I dislike the most is the slippery feeling in your body, after taking a hard earned shower, at the end of the day with softened water. Its like washing yourself with sea water. The sodium added to the water just wont allow proper soap rinsing and you never get to feel really clean. My house came with a huge Salt Water Softener, with two big tanks that took a lot of space in my garage which is not huge. After a long research, I decided to replace our salt softener with a Vulcan-Texas Anti-Scaler from Techno Mechanical Solutions in Austin. An affordable and eco-friendly way to prevent hard water issues without using salts. I was able to do the installation myself over the old softener pipes. The Vulcan requires no maintenance, just install and forget about it. No more salt buying trips to Lowes and carrying those back breaking bags. No more slippery feeling after taking a shower. No more calcium buildup around my fixtures or sprinkler valves. Water treated with Vulcan is safe for garden irrigation, your sprinkler system may also be protected. Vulcan dismantles prior limestone accumulations. Any pipe material may be treated up to 20 inches in diameter. The maintenance free Vulcan is very compact and sits of top of your pipe, saving all garage floor space for your favorite toys. Great for eliminating water lines and improve filtration in pools and spas. German engineering with 10 year warranty. Treatment for a normal size house with up to 1 1/2 inch pipe around $1000. Vulcan-Texas is space saver, effective, simple and affordable. Forgot to mention, my morning coffee tastes better without salt.