Every pool filter does one job: removing suspended dirt, dead algae, sunscreen oils, and fine grit from the water before the pump sends it back to the pool. What separates the three common types is *how fine* they strain and *what they ask of you* in return. Get that trade wrong, and you end up either fighting cloudy water all season or wasting hours and gallons chasing a level of clarity you never needed.

Your pump basket used to fill with water and stay clear. Now there is a rolling swirl of bubbles cycling through it, the pressure gauge won't hold a reading, and the returns push more air than water. The pump hasn't stopped running. But it's not really circulating anymore.

You find yourself adding water to the pool more often than you remember doing before. The level keeps creeping down, and you are caught between two thoughts: is this just the sun drinking the pool the way it always does in summer, or is water quietly escaping through a leak somewhere? Guessing wrong in either direction wastes water or misses a growing problem.

You walk out to the backyard, kids trailing behind you with towels in hand — and the pool is green. Not a vague tint. Actually green. The answer you're hoping to hear is "probably fine." It isn't. A green pool isn't a swimming pool right now, and knowing why makes it a lot easier to handle the situation instead of talking yourself into something you'll regret.

For a pool you use year-round, the salt-water-versus-chlorine question is a common one — and it's often misunderstood. Both types rely on chlorine to keep the water clean; the real difference is how that chlorine gets into the pool. Understanding that, along with the trade-offs in feel, maintenance, and cost, helps you choose the right system for a pool used year-round.

Few pool problems are as frustrating as adding chlorine, testing later, and finding the level back at zero. It feels like the pool is swallowing chlorine as fast as you add it — and in a sense, it is. When a pool won't hold a chlorine level, something is either consuming the chlorine or letting it disappear, and adding more without addressing that cause is a losing battle. Here's what's usually going on.

A salt water pool depends on its salt cell generating chlorine — so when the cell stops producing, the pool can quickly lose sanitation. The good news is that the causes are well understood, and several are simple to check and fix. Understanding why a salt cell stops making chlorine helps you get it generating again, or recognize when it's simply worn out.

The pool looked fine when you left for vacation. Two weeks later, you are standing at the edge looking at something that belongs in a bayou. The water is opaque dark green, there's a slick film on the surface, and whatever scent it's giving off isn't chlorine. Your first instinct is to start draining.

You are out on the patio when something sounds wrong. Not the usual low hum from the equipment pad — something rougher. A grinding that builds as the motor spins up, or a high-pitched screech that carries across the yard. You walk over to check, and the noise is definitely coming from the pump. The water is still moving, so you're wondering whether to leave it running or flip the breaker.

It's frustrating: you test the water, the chlorine and pH read right, and yet the pool looks like a glass of milk. That combination — balanced chemistry, cloudy water — is a strong clue that the cause isn't in your chemicals at all. A pool clears when three things work together: balanced water, good filtration, and good circulation. If the chemistry is handled, the answer is almost always in the other two, or in particles too fine for the filter to grab.

You went to bed with a clear pool and woke up after the storm to something the color of a pond. It feels like the rain itself turned the water green, but rain is just the trigger. What actually greened your pool is algae, and the storm handed it everything it needed in a single night. Once you see the chain of events, both the speed and the fix make sense.

You tested the chlorine 20 minutes ago. The strip read fine — maybe even a little high. The pool is still the color of split-pea soup. Something is wrong, but it isn't the number you tested.

You walk out to your pool on a Sunday morning, and the bottom looks like something dusted it with yellow powder overnight. Maybe the walls have a pale yellow-green haze in the corners, or the water's surface has a dusty film that wasn't there last week. Before you reach for the shock or the algaecide, you need to know what you're actually dealing with — because mustard algae and pollen look nearly identical in a pool, and treating the wrong one is either a waste of money or the start of a much bigger problem.

A pool that has not been significantly drained in several years is almost certainly carrying a TDS burden that is affecting its chemistry behavior in ways that are hard to diagnose without knowing to look for it.

You run your hand along the pool wall and feel what you've been quietly ignoring for two summers: the plaster is chalky in patches, rough near the steps, and in one corner, it's started to flake. You already know the job is coming. What you don't know yet is what you're actually deciding between when a contractor hands you three options at three very different price points.

You drop the shock in, watch the granules dissolve, and within ten minutes, the water goes from clear to a flat, chalky white — like someone poured a cup of milk into the shallow end. Your instinct is that you've made things worse. That instinct is almost always wrong, but understanding what just happened to your water chemistry is worth working through before you add anything else.

Florida pool ownership has a way of punishing the improvised approach faster than anywhere else in the country, and it's because the climate here doesn't give your pool any grace period when something slips.

[QUICKANSWER: Store oxidizers (chlorine tablets, shock) and acids (muriatic acid, dry acid) in completely separate, well-ventilated locations below 85°F. Keep all chemicals in their original containers, off the floor, and locked away from children. Never store calcium hypochlorite shock near trichlor tablets or muriatic acid — the combination can produce toxic gas or spontaneous combustion.]

Your pool pump has been running all day. The chemical readings look fine. And the water still has that flat, slightly hazy look — not green, not visibly dirty, just not right. You add a clarifier, things clear for two days, then drift back. Before you adjust another dial or pour from another bottle, check your equipment pad. The answer might be a filter that's letting particles slip through that it should actually be catching.

You saw the truck pull up, watched someone work for twenty minutes, and waved as they drove off. The water looks roughly the same as it did before. Was everything covered? Did they brush the walls? Did they actually test the chemistry or just eyeball it? That uncertainty is worth clearing up — because a thorough pool service visit and a rushed one look nearly identical from the pool deck.