Professional Pool Service
Green, mustard, or black algae in your pool? Nevergreen Pools handles algae removal in Manteca, CA with shock levels, brushing, and phosphate control.
Manteca summers run past 100 degrees from late May into the middle of October. At those water temperatures algae goes from a faint tint on the steps to a full bloom in about two days, so a pool that looked clear on Thursday can be unswimmable by Sunday night. Almond orchard dust blows in most evenings and adds to the organic load the chlorine has to burn through.
Green water is the symptom, not the problem. The cause is almost always some mix of sanitizer that ran out, circulation that was never quite enough, and phosphates sitting in the water feeding the bloom. Hard local water pushes pH upward on its own, and high pH cripples chlorine, so the same chlorine reading that held a pool in April stops holding it in August. Algae removal in Manteca is a chemistry job before it is a cleaning job.
Our crews cover this city in partnership with Vintage Pool Service, a longtime Central Valley company based right here on East Yosemite Avenue. Older plaster in the central part of town is porous enough to hold algae in the surface, and newer pebble finishes out in the subdivisions hide mustard algae in the shaded corners of the steps.
Green algae is free floating and the most forgiving of the three. It clouds the water, makes plaster feel slick underfoot, and it dies off within a day or two of a proper shock. Mustard algae, what most techs call yellow algae, is chlorine resistant and settles into low flow areas: the shaded wall, behind the ladder, the back edge of the steps. Brush it and it lifts in a yellow cloud, then drifts back down onto the same square foot of plaster a few hours later. Black algae is a different organism entirely. It is cyanobacteria, it roots down into plaster and grout, and it builds a waxy cap over itself that chlorine cannot get through. You can shock a pool with black algae to 20 parts per million and the heads will still be sitting there next week if nobody broke those caps open first.
So the first thing a tech does on an algae call is look at the walls and the floor, not just the water. Color, texture, where it is growing, and whether it wipes away under a thumb tell us which of the three we are dealing with and how many visits the job will take. Getting that read wrong is the most common reason a homeowner shocks the same pool four weekends in a row and never gets ahead of it.
Chemistry comes before chemicals. The municipal supply here is hard and high in alkalinity, which drags pH up on its own, and once pH is above roughly 7.8 a large share of the chlorine in the water is doing nothing at all. We bring pH into the 7.2 to 7.4 range and pull alkalinity down toward 80 to 100 parts per million when it is running high. Stabilizer gets tested at the same time, because the cyanuric acid reading sets the shock target. A pool holding 30 parts per million of stabilizer needs roughly 12 parts per million of free chlorine to sit at shock level, while a pool that has been running tabs all summer at 90 parts per million needs closer to 35, and that is a completely different volume of liquid chlorine. Above about 100 parts per million of stabilizer we drain and replace part of the water first, because no realistic chlorine dose will hold there. Only after that does shock actually work. From there the treatment splits by type:
Brush choice matters. Stainless bristles belong on plaster and nowhere else. On pebble, fiberglass, or vinyl we use nylon, because steel scores those surfaces and leaves marks that never come out. Pebble brushing is harder than most owners expect, since the texture that makes the finish look good also gives algae thousands of small pockets to grip. Older plaster runs the other direction. Worn or etched plaster is already porous, so algae removal in Manteca on a thirty year old surface often means accepting some staining underneath the growth and treating that as its own job once the water is clear. Salt pools get one extra check: a cell scaled up with calcium on this water puts out a fraction of its rated chlorine, so we pull it and acid wash it before blaming the chemistry.
Killing algae and clearing water are two separate steps. Once the bloom is dead, all of that organic material is still in the pool, which is why a treated pool usually turns milky gray or chalky blue before it turns clear. That load has to leave through the filter and the vacuum. Dead algae settles, so we vacuum to waste where the water level allows it instead of pushing everything back through the system, then refill and rebalance for the fresh water that just went in, and we keep the pump running long hours while the filter catches the rest.
The filter takes the beating. A cartridge that just processed a full green bloom comes out packed, needs a complete pull and rinse, sometimes twice in the same week, and then a soak in filter cleaner to strip the oils along with the calcium scale that hard Manteca water leaves in the pleats. Sand filters get backwashed until the sight glass runs clear, and DE gets recharged after every backwash. Watch the pressure gauge through all of it. A rise of 8 to 10 pounds per square inch over the clean starting pressure means flow has dropped far enough to stall the job. Skipping the filter work is how a pool goes clear on Wednesday and hazy again on Saturday, because a loaded filter cuts turnover, and low turnover is exactly where algae starts.
Almost every repeat bloom traces to one of three things: sanitizer that drops too low between visits, water that does not move enough, or a food supply nobody removed. Phosphates are the food supply. Orchard dust, lawn fertilizer that drifts in, cottonwood debris in spring and leaves in fall, and refill water all add phosphate, and a pool sitting at a high phosphate level will bloom again on the first hot week even with a reasonable chlorine reading. We test for it, use a phosphate remover when the reading runs past roughly 500 parts per billion, then clean the filter again afterward, since the remover binds phosphate into something the filter has to trap.
Circulation is the other half. Dead spots behind ladders, in deep end corners, and under steps are where mustard and black algae get their start, so we aim the return eyeballs down and to one side to roll the whole body of water over, and we set pump run time against water temperature rather than the calendar. A working rule in this heat is one hour of run time for every ten degrees of water temperature, which means a six hour spring schedule needs to go to ten or more through a 105 degree August. Pools in Manteca, Lathrop, Ripon, and Tracy all deal with the same thing: water warm enough to demand far more sanitizer than the same pool needed in April.
After that it is steady service. Weekly brushing of walls and steps, free chlorine held at roughly 7 to 8 percent of the stabilizer reading instead of chased up and down, stabilizer kept in the 30 to 50 parts per million range so the sun is not burning chlorine off by noon, and pH corrected on every visit given how quickly it climbs on this water. Done that way, algae removal in Manteca ends up being a one time job instead of a recurring one, and most of the pools we bring back from a full green bloom never go green again.
Related services in Manteca: Green Pool Clean-Up in Manteca and Chemical Treatment in Manteca.
