Choosing the Barrier: Mesh, Iron or Glass
There are three common ways to enclose a pool in a Tempe back yard, plus the block wall that may already run around it. They cost different amounts and last different lengths of time, and the real trade is how much of the yard you are willing to look at through a fence.
What each one trades away
Removable mesh is the least expensive and the least permanent. It drops into sleeves set in the deck and comes out when you want the space back, which suits a yard where the pool is the only reason you are fencing. It also depends on the household more than the other two do, because a barrier that spends half the summer in the garage is not doing much.
Iron is the middle of the range and what most Tempe yards end up with. It is permanent, it takes our summers without complaint, and you can still see the water through it, which matters when the pool is the best thing in the yard. What iron asks for in return is attention low down, where the coating is thinnest and the irrigation lands. Rust starts at the bottom and works up, so iron that looks fine at eye level can be tired at the base. Wrought iron fencing goes further into that.
Glass costs the most by a clear margin, and people choose it because it more or less disappears. On a small yard, where a run of pickets would cut the space in half visually, that is worth real money. It is also the most demanding to keep looking right.
The wall you already have
Plenty of Tempe pools sit in yards already ringed with block, and a sound wall can carry part of the enclosure, which makes the job smaller and the price lower. The condition is that it is genuinely sound. A section that has started to lean, a crack stepping up through the mortar joints, or a cap that has lifted is a wall in motion, and walls in motion open gaps. That gets put right before it gets counted on. Block wall repair covers the diagnosis, and where a side of the yard needs closing off, new block wall construction covers how those runs go in.
Where block does the perimeter, the gate is the piece built into it, and building the opening properly is worth more than hanging good hardware on whatever is there.