http://www.SwimmingPoolSteve.com - If you can feel bumps on the walls of your swimming pool, underneath the vinyl liner, then the cause is usually one of two things: 1) Calcium growth on the wall is building up to the point that you are able to feel it through the liner. It would feel like texture, but not specifically sharp. It would also be more or less equally dispersed throughout your pool. 2) Rust is growing on the galvanized steel walls of your pool. This would almost always be as a result of a leak in this immediate location. It is also possible that a very large leak exists which would cause all of the walls in the pool to rust. Rust is hard and sharp feeling - much more so than the calcium scale. ... https://www.youtube.com/watch?v=rsDKg2a8zfc

http://www.swimmingpoolsteve.com discusses why single speed pumps are not energy efficient and how dual speed and new variable speed pumps work to reduce electrical costs while still meeting flow requirements for a clean and clean swimming pool. More info about pool pumps, where to buy and pool pump reviews at http://www.poolpump.ca ... https://www.youtube.com/watch?v=bKV7JrMW6O8

From http://www.swimmingpoolsteve.com/pages/pool-plaster.html - Steve explains that an average pool plaster fora residential pool takes anywhere from 4 to 6 hours for a skilled four person team. It is not uncommon for pool plasterers to plaster more than one pool every day. ... https://www.youtube.com/watch?v=PTuT7aE7cXk

From https://www.swimmingpoolsteve.com/pages/vs-programming.html - Swimming pool plumbing systems are all uniquely designed and no two systems are the same. Knowing that all pools will have their own individual flow rates and restrictions will help you understand the pools specific requirements. Here we test the flow rates and power consumption of a 24 hour dynamic filtration schedule for a swimming pool (almost 16,000 gallons at 3 turnovers of the total pool volume per day) that is using a Black + Decker Variable Speed 1.5hp pool pump on 1.5" pipes with a 150 square foot cartridge filter with approximately 35' total dynamic head. The flow rates and power usage is shown for this 24 hour filtration schedule that will result in approximately 47,500 gallons of filtered water for just $0.81 every day (based on the national average electricity cost of $0.13/kWh). This same 24 hour schedule can be seen demonstrated on a 2" plumbing system in this video: https://youtu.be/FnFQgfm11gg #SwimmingPoolSteve #filtrationschedule #poolpump #smallpool ... https://www.youtube.com/watch?v=w_B4jUU_5Ds