GOT BUGS IN YOUR POOL? HERE'S WHAT THEY'RE REALLY TELLING YOU
By AchtwooPool | Professional Pool Cleaning Services | Orange, Texas | Southeast Texas | Southwest Louisiana
If you've got bugs swimming in your pool, the problem isn't the bugs. The bugs are just the messenger and they're delivering news that your pool's chemistry has already been trying to send you for days. Here's what those insects are actually reporting, why scooping them out never works, and the exact steps to make them disappear for good.
Table of Contents
The Bug That Isn't Really the Problem
Meet the Two Insects Most Commonly Found in Pool Water
What Bugs in Your Pool Are Actually Telling You
Why Scooping Them Out Never Solves Anything
Step One: Brush Every Surface Before You Treat
Step Two: Shock at Night With a Double Dose
Step Three: Run the Pump for at Least 8 Hours
Why Night Treatment Is What Makes Shock Effective
How to Make Sure the Bugs Never Come Back
Bugs Keep Coming Back No Matter What You Try?
The Bug That Isn't Really the Problem
It was the middle of a hot Tuesday morning when a pool owner in Southeast Texas called, frustrated and baffled. She had scooped the insects out three days in a row. She had added extra chlorine. She had even tried a bug spray near the pool edge which, understandably, didn't do much for the water quality. The bugs came back every single time. Same species. Same area of the pool. Apparently unbothered by her efforts.
The answer wasn't a stronger scoop or a better bug spray. The answer was that her pool had algae; not visible green algae, not the kind that turns the water murky and obvious, but the early-stage microscopic growth that clings to surfaces and exists below the visual threshold of a casual inspection. The insects weren't invading her pool. They were feeding in it. And they would keep coming back for as long as the food source remained.
This is the situation pool owners across Orange, Texas, Southeast Texas, and Southwest Louisiana encounter repeatedly throughout pool season: bugs treated as the problem, when the bugs are in fact the symptom of a problem that started days earlier and hasn't been addressed yet.
Meet the Two Insects Most Commonly Found in Pool Water
Not every bug that ends up in a pool is there by accident. There are two specific insects that are reliably found in pools with early-stage algae conditions, and distinguishing them from accidental visitors helps understand what their presence is communicating.
Water boatmen are oval, flat insects roughly a centimetre in length that move through water with a rowing motion using their elongated hind legs which is where the name comes from. They are harmless to humans and are in your pool specifically because they eat algae and the microscopic organisms associated with it. They breathe air and periodically surface, which makes them visible. They are not aggressive and will not bite.
Backswimmers look superficially similar to water boatmen but are distinguished by their habit of swimming on their backs and by one important difference: they will bite if handled. Like water boatmen, they are in the pool because the algae-rich environment provides the food chain they feed on. They eat the smaller organisms that water boatmen attract, which means a backswimmer presence often indicates a slightly more established algae situation than water boatmen alone.
Both insects are, in their own way, precise indicators. They are not the cause of the pool's problem. They are the living evidence of a food source that wasn't there before and that food source is algae at a stage where your test kit may not yet be showing it clearly.
What Bugs in Your Pool Are Actually Telling You
When water boatmen or backswimmers are present in your pool, they are communicating something specific: algae is already growing. Not necessarily in the quantities where it colours the water or coats the walls visibly, but growing on surfaces, in the microscopic layer of the water column, in the corners and crevices where circulation is weakest and chlorine distribution is least reliable.
These insects navigate toward the algae conditions they need to feed and reproduce. They don't enter pools randomly. A pool with properly balanced, consistently maintained chlorine between 1 and 3 ppm at the correct pH doesn't produce the algae conditions that attract them. The presence of water boatmen or backswimmers is a reliable early indicator that the sanitiser has dropped, that pH has drifted to a point where chlorine's effectiveness has been compromised, or that both have been happening for long enough to allow algae to establish below the visible threshold.
The pool owner who spots these bugs and acts on the chemistry rather than the bugs themselves addresses the problem at its early stage, before it progresses to the visible green water and surface coating that requires a full restoration treatment. The pool owner who scoops the bugs and adds a moderate extra dose of chlorine is addressing the symptom and leaving the cause in place.
Why Scooping Them Out Never Solves Anything
Here is the simple reason that scooping insects out of a pool never produces a lasting result: the insects are not the source of the problem. Removing them has no effect on the algae they came to feed on. New insects detect the same conditions and enter the pool to replace them. The pool owner returns the following morning, finds the bugs again, scoops them out again and the cycle repeats until the algae is addressed.
Scooping is not wasted effort in the literal sense. Removing insects from the pool is fine. But it should be followed immediately by an algae treatment protocol because the bugs' presence has confirmed that algae is there, and the only way to stop the bugs from returning is to eliminate what they came for.
Step One: Brush Every Surface Before You Treat
Before any chemical treatment is applied, brush the entire pool; walls, steps, floor, corners, and the waterline tile thoroughly.
This step is critical and frequently skipped. Early-stage algae clings to surfaces. It is not freely suspended in the water column where shock can reach it directly. Brushing breaks the physical bond between algae cells and the pool surface, suspending them in the water where the shock treatment can contact and destroy them. Shock applied to an unbroken pool with algae still attached to surfaces is working at a fraction of its potential efficiency, most of the algae is protected from the chemical treatment by its surface adhesion.
Brush methodically. Start at the waterline, work down the walls, cover the steps and bench areas, and finish with the floor. Pay particular attention to corners, behind ladders, and any areas with reduced water movement; these are the zones where algae establishes first and holds on longest. Everything you dislodge with the brush becomes accessible to the chemical treatment that follows.
Step Two: Shock at Night With a Double Dose
Once the pool has been thoroughly brushed, it's time to shock and both the timing and the dosage matter significantly.
For a pool of approximately 20,000 gallons showing early-stage algae indicated by insect presence, a double dose of shock is the appropriate starting point. This means roughly 4 pounds of calcium hypochlorite shock, broadcast evenly across the pool with the pump running. For larger or smaller pools, scale proportionally based on the volume.
The reasoning behind the double dose is straightforward: early-stage algae, even when not visibly obvious, has established enough of a presence to require a higher sanitiser concentration to break through and destroy it completely. A standard maintenance dose of shock may temporarily suppress the algae without killing it fully, allowing it to re-establish and the bugs to return within days.
Be precise with the quantity. More is not always better: excessively high chlorine levels damage pool surfaces and equipment, affect swimmer comfort, and take a long time to return to the swimable range. The double dose is calibrated for the specific purpose of algae kill. Follow dosing instructions on the product label for your specific pool volume.
Why Night Treatment Is What Makes Shock Effective
The timing of shock treatment is not an arbitrary preference, it has a direct and significant effect on how much of the treatment actually performs the work it's intended for.
Sunlight destroys free chlorine through UV radiation. Without adequate cyanuric acid stabiliser to shield it, unstabilised chlorine can lose the majority of its active concentration within two hours of direct sunlight exposure. This means a shock treatment applied on a bright morning may have lost a substantial portion of its effective strength before it has had time to kill the algae it was added to address.
Shock applied after sunset works through the night without UV degradation. The full dose remains active and concentrated in the water for the hours when it is doing the most important work destroying algae cells, oxidising organic contaminants, and pushing chlorine to the levels where it can overwhelm and eliminate the early-stage growth that attracted the insects. By the time the sun rises the following morning, the treatment has had eight to ten hours to work unimpeded.
Night shocking is not just a recommendation. In warm, sun-intensive climates like Southeast Texas and Southwest Louisiana, where summer UV exposure is extreme and pool water temperatures accelerate chlorine consumption, it is the difference between a shock treatment that works and one that largely evaporates before it can.
Step Three: Run the Pump for at Least 8 Hours
After adding the shock, run the pool pump continuously for a minimum of eight hours overnight through to morning is the ideal window.
The pump's job in this context is distribution. Shock treatment added to one area of the pool at the time of application needs the pump to carry it throughout the full water volume, into the dead zones where algae is concentrated, and through the filter system where captured algae and debris will be removed from circulation. A pump that cycles off after two hours leaves large portions of the pool under-treated while the shock sits concentrated near its introduction point.
Eight hours of continuous circulation ensures the treatment reaches every area of the pool. It also ensures that the filter processes the dead algae material loosened by the shock and the brushing which, if left in the water, would create a new food source and potentially re-seed the conditions that attracted the insects in the first place.
After the overnight run, check the filter pressure and clean or backwash if needed. Test the water chemistry. Confirm that free chlorine has returned to the operational range of 1 to 3 ppm and that pH is within 7.4 to 7.6. If the water is still cloudy the following morning, run the pump for another full cycle before retesting.
How to Make Sure the Bugs Never Come Back
The insects returned because the algae conditions developed and those conditions developed because chlorine dropped below effective levels, pH drifted, or both happened simultaneously for long enough to give algae the window it needed.
The preventative answer is consistent sanitiser management. Pools that maintain free chlorine steadily between 1 and 3 ppm, with pH held in the 7.4 to 7.6 range, almost never develop the algae conditions that water boatmen and backswimmers are attracted to. Not occasionally, not reactively consistently, through weekly testing and small, timely adjustments that catch drift before it becomes an opportunity for algae to establish.
In Southeast Texas and Southwest Louisiana, where summer heat accelerates chlorine consumption and UV intensity depletes unstabilised sanitiser rapidly, the consistency of that routine matters even more. A pool that is well-balanced going into a hot week stays ahead of algae. A pool that has been left without a chemistry check since last weekend may already be providing the conditions those insects are navigating toward even if the water still looks clear.
Eliminate the food source. The bugs have nowhere to go.
Bugs Keep Coming Back No Matter What You Try?
If water boatmen or backswimmers are a recurring feature of your pool season despite regular scooping and additional chlorine doses, the root cause hasn't been addressed. The algae that's feeding them is still there below visible detection, on surfaces, in the low-circulation zones where a standard maintenance dose of chlorine doesn't fully reach.
At AchtwooPool, we treat the cause, not the symptom. Proper brushing before treatment, correctly dosed and timed shock at night, and consistent chemistry management across Orange, Texas, Southeast Texas, and Southwest Louisiana; that's the approach that makes the bugs disappear and keeps them gone.
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Kill the algae and the bugs lose their food. No food; no bugs. Let's take care of it properly.