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Pool Cleaning

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Pool cleaning is the physical half of looking after a pool: brushing and vacuuming the basin, skimming the surface, cleaning the waterline, emptying baskets, and backwashing or cleaning the filter so that what you have collected actually leaves the system. It is the part people either enjoy or automate, and it is also the part with an environmental consequence nobody mentions at the point of sale.

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That consequence is volume. Every backwash sends water out of the pool, and a drain down sends all of it. Where that water goes is a legal question in Britain, not a matter of convenience. Section 111 of the Water Industry Act 1991 makes it an offence to throw, empty or turn into a public sewer or a drain communicating with one any matter likely to injure the sewer or drain, to interfere with the free flow of its contents, or to affect prejudicially the treatment and disposal of its contents, and it also covers chemical refuse and liquid above 43 degrees Celsius that is dangerous, causes a nuisance or is injurious to health. The offence carries a fine on summary conviction, with further daily fines, or on indictment up to two years' imprisonment, a fine, or both.

In practice that means a hose run into the nearest gully is the wrong instinct, because in most British gardens the nearest gully is a surface water drain that goes to a watercourse without treatment. Getting the disposal route right is a two-minute conversation that avoids a genuinely serious offence.

What a thorough pool clean covers, in order

  • Skim the surface first, because debris that has not yet sunk is far easier to remove than debris on the floor.
  • Empty skimmer and pump baskets before doing anything that will load them further.
  • Brush walls, steps, corners and the waterline, working from the shallow end toward the deep, so material moves where the vacuum can reach it.
  • Clean the waterline separately, since sun cream, oils and airborne dirt build a tide mark that brushing alone does not lift.
  • Vacuum slowly; a fast head lifts debris back into suspension and leaves you doing it again tomorrow.
  • Check and clean the filter after a heavy vacuum rather than before it, and note the pressure both times.
  • Finish by restoring flow and letting the pool circulate, because a clean pool with a blinded filter is only briefly clean.

Manual, suction, pressure and robotic cleaners compared

  • Manual vacuum on a pole: cheapest, most thorough, and the only method that lets you see what you are doing.
  • Suction cleaners: driven by the pool's own pump, simple and inexpensive, but they load the filter and the pump with everything they collect.
  • Pressure cleaners: driven from the return side, usually with their own bag, so they keep debris out of the main filter.
  • Robotic cleaners: independent of the pool's circulation with their own filter, generally the best result for the least effort on a domestic pool.
  • In-floor systems: built in at construction, excellent when designed properly, and effectively impossible to retrofit.
  • Whichever is used, a British pool under trees still needs a net and a pair of hands in autumn; no cleaner keeps up with leaf fall.

Where backwash and drain down water may lawfully go

Start with the volumes, because they are larger than people assume. A single backwash on a domestic sand filter moves a meaningful fraction of the pool's water, and a full drain down moves all of it, generally over a few hours. That is why the destination matters: it is not a bucket of water, it is a sustained discharge of chlorinated water at a rate that a garden, a ditch or a soakaway may not be able to take.

The Environment Agency's position for England is set out through the de minimis exclusions from environmental permitting. You may discharge onto land five cubic metres per day or less of swimming pool drain down water that is of drinking water quality, with no discernible hazardous substances and no concentrations of non-hazardous pollutants above drinking water standards. The conditions attached are specific: you must leave swimming pool water to dechlorinate for at least two days before discharging it, and it must not contain concentrations of chlorine above 0.2mg per litre. Above that volume, the expectation is that you connect to the public foul sewer where it is reasonable to do so, or apply for a permit where it is not. Swimming pool drain down or backwash water discharged separately from other domestic sewage is not treated as domestic sewage, because it is not like the effluent from a normal home.

The foul sewer route needs the sewerage undertaker's agreement rather than your assumption, and section 111 of the Water Industry Act 1991 is the reason. Ask your water company before the first backwash of the season, not after. And do not use a surface water drain: in most British gardens that discharges to a watercourse untreated, which is exactly what chlorinated water should not do. Scotland and Wales are regulated separately, by SEPA and Natural Resources Wales, so check the position with the regulator for your own country rather than relying on an Environment Agency exclusion written for England.

Cloudy water, algae and staining: what the pool is telling you

  • Cloudiness that survives correct chemistry: filtration is not catching the fine fraction, and the media or the flow rate is the cause.
  • Green algae that returns in the same corner: circulation, not chemistry, and usually a return pointed the wrong way.
  • Black or dark spotting in grout and rough render: a stubborn form that needs mechanical removal as well as treatment.
  • A slippery waterline that keeps coming back: biofilm, which needs physical cleaning rather than more disinfectant.
  • Brown or rust staining after a refill: metals in the fill water, which is a treatment question rather than a cleaning one.
  • Grit that reappears after every vacuum: filter media passing back into the pool through a damaged lateral or a failed internal.
  • Debris on the floor every morning in autumn: a cover problem or a skimmer problem, not a cleaner problem.

A British cleaning year: leaves, pollen, algae and rain

Spring is pollen and the first algae. A warm week in April will bloom a pool that has just come out of its cover, and the cleaning effort is mostly about keeping the filter working while the water clears. Late spring brings blossom and seed, which are fine, float and go straight through a skimmer basket into the pump.

Summer is bather load rather than debris. Sun cream, oils and the residue of a busy weekend end up at the waterline and in the filter, which is why waterline cleaning is a summer job and why filters need more attention in a hot spell than a British owner expects.

Autumn is the heavy season, and it is not one visit. Leaf fall goes on for weeks, so a single clearance does not hold, and leaves left in a warm pool break down and load the water chemically as well as physically. Winter, for a closed pool, is about keeping the cover clear rather than cleaning the pool; for an open, heated pool it is about rain diluting the chemistry faster than most owners expect.

What a pool cleaning quote reflects, and how LokalMatch fits in

Cleaning is priced on time, debris and disposal. The variables are the surface area and depth of the pool, how much of the cleaning is automated already, how exposed the pool is to trees and prevailing wind, whether the waterline needs regular attention from sun cream and oils, how often the filter has to be backwashed and where that water can legally go, and whether the visit includes water testing and correction or only the physical work. A pool under mature trees in autumn is a different commitment from the same pool in July.

LokalMatch is simply how you find the people who do it. Set out the pool, the surroundings and how often you want someone, once, with your postcode, and cleaning and servicing firms near you will contact you with their own terms. There is no cost to homeowners and the pros pay for the enquiries they receive. LokalMatch does not clean pools, takes no part in pricing, and does not vet, rank or recommend anyone who gets in touch, so checking what a visit covers and how backwash water will be disposed of is your call.

Pool Cleaning: frequently asked questions

Can I put pool backwash water down the drain?

Not into a surface water drain, which in most British gardens runs to a watercourse without treatment. The foul sewer is the normal route, but it needs the sewerage undertaker's agreement rather than your assumption: section 111 of the Water Industry Act 1991 makes it an offence to empty into a public sewer or a drain communicating with one any matter likely to injure it, interfere with the free flow of its contents or prejudicially affect treatment and disposal, with penalties running to a fine on summary conviction or, on indictment, up to two years' imprisonment, a fine, or both. Ask your water company before the first backwash of the season.

Can I drain my pool onto the garden?

In England, within limits. The Environment Agency's de minimis exclusions allow a discharge onto land of five cubic metres per day or less of swimming pool drain down water that is of drinking water quality, with no discernible hazardous substances and no non-hazardous pollutants above drinking water standards. Two conditions attach: the water must be left to dechlorinate for at least two days before discharging, and it must not contain chlorine above 0.2mg per litre. Above five cubic metres a day you are expected to use the public foul sewer where that is reasonable, or to apply for a permit. Scotland and Wales are regulated by SEPA and Natural Resources Wales respectively.

Is pool water treated as domestic sewage?

No. Swimming pool drain down or backwash water discharged separately from other sources of domestic sewage is not classed as domestic sewage, because the effluent is significantly different from what comes out of a normal home. That matters, because the general binding rules and guidance written for small domestic sewage discharges do not simply transfer to a pool. Treat the disposal route as its own question and settle it with your water company or the environmental regulator for your country.

Is a robotic cleaner worth it on a British pool?

Often, because the main alternative loads your own plant. A robotic cleaner works independently of the pool's circulation and collects into its own filter, so it does not push leaves and grit through the pump basket and the main filter the way a suction cleaner does. On a pool under trees that is a real advantage. What no cleaner does is keep up with British autumn leaf fall, so a net and a cover still earn their place.

Why does my pool go cloudy even though the chemistry reads correctly?

Because clarity is a filtration problem more often than a chemical one. If the readings are right and the water is still hazy, the filter is not catching the fine fraction: the media may have channelled, the flow rate may be too high for the bed to work, or the internals may be damaged and letting water bypass. Check filter pressure against its clean baseline and look at the media before adding anything else to the water.

How often should an outdoor British pool be cleaned in autumn?

More often than in summer, and more than once. Leaf fall goes on for weeks rather than landing in a single afternoon, and leaves left in warm water break down and load the pool chemically as well as physically, which shows up as disinfectant demand rather than as visible debris. Where a pool sits under mature trees, a cover between uses does more for the workload than any cleaning equipment.

Sources

  1. Water Industry Act 1991, section 111 (restrictions on use of public sewers)
  2. GOV.UK / Environment Agency: groundwater activity exclusions from environmental permits (swimming pool drain down water; 5 cubic metres a day; 2 days' dechlorination; 0.2mg per litre chlorine)
  3. GOV.UK: discharges to surface water and groundwater, environmental permits

Written by the LokalMatch editorial team. Last reviewed 21 September 2026. How we write and check our guides

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What affects the cost of pool cleaning

Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:

  • Type and size of pool or hot tub
  • Excavation and site access
  • Pumps, filters, heaters and covers
  • Decking, fencing and landscaping around it
  • Electrical and gas connections
  • Condition of existing equipment for repairs

How to compare pool cleaners before you hire

  • Choose a company that works on your type of pool or hot tub, whether it's in-ground, above-ground or a spa.
  • For a new pool, ask who handles the permit, the fencing requirements and the electrical and gas connections.
  • Make sure electrical and gas work for heaters, pumps and hot tubs is done by licensed trades.
  • Get a written quote that covers excavation, backfill, equipment, decking and site restoration.
  • For openings, closings and maintenance, ask exactly what each visit includes.

Questions to ask pool cleaners before you hire

  • Who will get the permit, and what fencing or gate rules will I need to meet?
  • Who will do the electrical and gas hookups, and are they licensed?
  • What equipment do you recommend, and why?
  • What does the warranty cover for the pool shell or liner, the equipment and your installation?
  • How will you get equipment into my yard, and how will you restore the lawn afterwards?
  • What is included in an opening, closing or maintenance visit?

When to call a pro for pool cleaning

  • Water level dropping faster than usual, which may mean a leak
  • A pump, heater or hot tub that trips the breaker: keep people out of the water and call a qualified technician.
  • Cloudy or green water that doesn't clear with regular care

Pool cleaning permits and local rules

Some pool cleaning work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.

Permits and licensing

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