1. What can I use to blow out lines? 2. How to blow out main lines? 3. Do I need to blow out any water from/through the heater?
What are you missing here? I only see plumbing with some shut off valves. Did you photo shop the picture? Maybe you can take pictures from different angles with everything there.
But to answer your questions, please see below:
1) A leaf blower will not work. Some people use a pancake compressor or regular compressor (with great success) and hook everything up to the fitting in the pump housing. Some people use a shop vacuum with great success. Personally, I have purchased the Cyclone and we just closed my friends pool (without cover) in less than 5 minutes. You will need to push volume, not pressure through the lines. Set the PSI at low, under 20 on the air compressor.
First time closing pool!!
Post # 7 for the standard air fittings. Good Thread.
2) You have to blow out the main lines (return lines and plug them one at a time). The skimmers will require Gizmo's and the Main Drain is where you can create an "air lock'. The main drain has to bubble at the surface of the water.
3) When you blow air through the system, the water will be pushed out of the heater as well. There will be plugs that you can disconnect at the heater as well. Also, make sure you remove all the fittings at the filter and pump basket.
Again, it is hard to tell without all your equipment in the pictures. Please add your signature so it shows up on all the threads. Lastly, if you are struggling with closing the pool, it may be best to find someone locally as the charge in NJ is really not that much. I have seen $150 as a good rate. Depending on the cover you have, you may even be able to work out a deal with the tech for $100 and you can put your own cover on. I paid the first year and watched and learned. Then I closed my pool the 2nd year and this will be the 3rd year.
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I see that you have a heat pump. You can siphon the water out with a vacuum. Lastly, you did not have to go to the trouble of removing anything outside. All the equipment is designed to stay outdoors. Some people do remove the pump, but not the filter or plumbing. Please advise.