Pool Gate Latches and Self Closing Hinges

Nothing about a pool gate that closes slowly looks wrong until the day it stays open, and the notes on gates in Carlsbad, CA, including those at carlsbad iron gates new trouble, treat the self closing action as the whole job. A pool barrier gate in Carlsbad must swing shut from any open position and latch without a hand on it. The gate frame is almost secondary to that behavior.
What self closing means in practice

A pool gate has to return to the closed and latched position from every open angle, including one inch off the latch. A spring hinge or a gas closer does the pulling, and a latch with a raised catch locks it. The latch is set high enough on the post, and often on the pool side, that a small child cannot reach it, and the release lifts upward rather than pushing.
Types of hinge that close a gate

Adjustable spring hinges let the installer set closing speed by turning a tension screw. Hydraulic closers slow the final few inches, which stops the gate from slamming into the latch. Both rely on a hinge post that stays plumb, and an aluminum or wrought iron leaf has to hang square for the spring tension to be even.
Why slopes and sag defeat them
A yard that falls away from the house near Agua Hedionda Lagoon makes the latch edge of the leaf want to swing toward the low side. If the gate is out of level by half an inch, the closer pulls it into the catch at a skewed angle and the latch bar rides over the strike. A settled post has the same effect. The tension on the spring is correct and the gate still fails to latch.
Materials for a wet yard
Pool areas stay damp and chlorinated, which attacks bare steel quickly. Aluminum or powder coated steel with a galvanized base layer holds up best, and stainless hardware keeps the spring hinge from seizing. Pickets spaced under four inches apart with no horizontal rail a child could climb are the usual form for a pool gate in La Costa and Oceanside neighborhoods.
Testing the gate
Hold the gate open at several angles, release it and watch it latch every time. Do this with the leaf wet and again when the day is hot, since metal expands and a tight latch can bind by afternoon. Any gate that stops short of the catch needs the tension turned up or the strike moved, never a bungee cord or a wedge.