Plumbing isn’t hard; purple stuff, blue stuff, twist, push together and hold 30 seconds. Pretty simple. I’m just kidding; it’s actually a little harder than that… Like 10% harder, you aren’t building a rocket ship.
Lets cover a few things first:
1. Primer (aka purple stuff) – This isn’t Kool-Aid so don’t drink it, but it is important. Various sources online will tell you this stuff is critical or it’s a waste of money. If you research this yourself you’ll read about amorphous crystalline structures, transition states, solvent welding and on and on and on.
Here is the important part, using the purple stuff almost certainly doesn’t create a weaker joint by changing the welding properties of the final PVC weld, but it almost certainly remove debris and other containments from your connections and makes an amateur plumber more likely to have leak free joints. It’s a cheap enough insurance for the less experience plumber so that it’s a no brainer.
2. DWV versus pressure fitting. DWV stands for Drain, Waste and vent and is not rated for the pressure on a pressurized pool system. During the inspection phase you will most likely need to maintain 35 PSI and it’s really unlikely that DMV fitting will hold that pressure. The fittings are cheaper than a Pressure fitting, but you get what you pay for here. If you have a friend with a pool leak, he probably has DMV fitting somewhere leaking.
3. Critical step for connections. When making connections with fittings or pipe to pipe, the main reason for leakage is not seating the connection fully. It’s so critical that you push the connection all the way to the seat of the fitting and give a little twist. You will want to hold each and every connection for 30 seconds. Take your time here, it’s worth it. These two operations together ensure proper solvent across the entire connection. Using a good technique here makes chances of leaks really low.
There are 3 part to the plumbing: the underground (stuff under the concrete), from the pool to the pad (still underground but not under concrete), and all the stuff at the equipment pad and mostly above ground.
The plumbing under the concrete must be inspected before the concrete is in. From the pool to the pad can be done later, don’t get caught up on this right now. And obviously the equipment pad stuff is done last and inspected right before you can fill the pool.
Do not Do not Do not put water in your pool until you have confirmation from your building inspector you have reached that step. They can shut you down and make you drain your pool if you get ahead of yourself. Ask questions and listen to their advice.