HTH Professional Pool Treatment
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  • Unterstützung
    • Webinare
    • Problemlösung
  • Verkaufsstellen
  • Produkte im Einsatz
  • private Schwimmbäder und Spas
  • Products
    • Sanitise
    • Balance
    • Prevent & Cure
    • Clean
  • Equipment
    • Feeders
    • Controllers
    • easiflo Eco
  • Support & Contact
    • Webinars
    • Troubleshooting
    • Downloads
  • Where to Buy
  • Products in action
  • Videos
  • Private swimming pools and spas
  • Produits
    • Désinfecter
    • Equilibre
    • Prevention et curatifs
    • Nettoyer
  • Equipement
    • Systemes de dosage
    • Régulations
    • easiflo Eco
  • Services Support & Contact
    • Formations hth
    • Webinaires
    • Problemes-Solutions
    • Bibliothèque
  • Où trouver nos produits
  • Produits en action
  • Vidéos
  • Piscines et Spas privés
  • Produkte
    • Desinfektion
    • Gleichgewicht
    • Vorbeugung & Unterhaltung
    • Reinigung
  • Chlordosierer
  • Unterstützung
    • Webinare
    • Problemlösung
  • Verkaufsstellen
  • Produkte im Einsatz
  • private Schwimmbäder und Spas


Troubleshooting​

The remedies for these common pool problems can be found here.
If you are experiencing any other symptoms please ​contact us.
​Cloudy Water
PROBABLE CAUSE
UNDERLYING REASON
TO RECTIFY
Build up of dirt and bather pollution
Insufficient chlorine or poor filtration
Backwash filter then super chlorinate to 10mg/l of free chlorine.
​Add clarifier to polish water
Air particles reflect light giving cloudy appearance in pool
Air being drawn into system
Check all joints on suction side of pump
​Check air release valves, water level should be checked
Start of algae growth
Insufficient levels of chlorine
Super-chlorinate and after 24 hours backwash filter
Maintain chlorine level at 1.5 mg/l
Prevent recurrence of algae growth
Chroline ineffective
Over stabilisation  (if using isocyanurates - dichlor or trichlor)
Dilute pool water and super-chlorinate
Ineffective filtration
Filter blocked or filter media needs renewing
Check sand filter cartridge, or DE Media
Suspended particles
Precipitation of salts due to high pH or high alkalinity
Correct pH and/or alkalinity
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Unpleasant water
PROBABLE CAUSE
UN​DERLYING REASON
TO RECTIFY
High combined chlorine
High combined chlorine
Super-chlorinate
Detergents from cleaning compounds getting into pool water
​Reaction between chlorine and detergent
Use pool compatible/biodegradeable cleaners
​Water too acidic or alkaline
​Water too acidic or alkaline
Correct pH value
Chlorine Level difficuLT TO MAINTAIN
PROBABLE CAUSE
UNDERLYING REASON
TO RECTIFY
Sunlight destroys chlorine
Chlorine not stabilised
Add stabiliser to preserve chlorine levels
Insufficient chlorination
Build up of pollutant
Super-chlorinate
High water temperature
Organisms multiply more quickly/chlorine liberated from pool easily
Increase dose rate of sanitiser
​pH too high or too low
PROBABLE CAUSE
UNDERLYING REASON
TO RECTIFY
Not enough pH corrective being added
Mains water pH high
Add pH corrective as necessary
High pH of local mains water
Insufficient Dry acid being added, or applied incorrectly
Add acid per instructions. Maintain pH between 7.2 and 7.6.
Reduce alkalinity to recommended level
Use of alkaline chlorine donors
High alkalinity
Adjust with relevant chemical
Salts being leeched from new concrete pools
Self correction over a period of time
Check pH
​Pool walls feel slimy
PROBABLE CAUSE
UNDERLYING REASON
TO RECTIFY
Algae growth on pool surfaces
Insufficient chlorination and/or pool water brushing/vac
Super-chlorinate to kill algae. Sweep or vacuum debris

Prevent re-occurrence with algicide
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pH levels erratic
PROBABLE CAUSE
UNDERLYING REASON
TO RECTIFY
Low total alkalinity
Insufficient bicarbonate to buffer pH
Add bicarbonate to raise alkalinity to 80-120 mg/l.
​Maintain pH at 7.2 - 7.6
​No chlorine reading on test kit
PROBABLE CAUSE
UNDERLYING REASON
TO RECTIFY
Chlorine level may be too high
High chlorine content bleaches reagent in test tablet
De-chlorinate

Dilute or allow chlorine to reduce naturally over a period

If very high  reduce with chemicals
No chlorine present
Automatic controller has "locked out"

​No chlorine in feeder
Re-set controller

​Re-fill feeder
​Dirt on pool walls at waterline
PROBABLE CAUSE
UNDERLYING REASON
TO RECTIFY
Build of body fat, sun oil or cosmetics
Irregular cleaning of surfaces
Clean with biodegradable chemical
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​Scale on pool surfaces
PROBABLE CAUSE
UNDERLYING REASON
TO RECTIFY
Water out of "balance"
Ratio of calcium hardness to total alkalinity incorrect
Check levels of pH alkalinity and calcium
​SHARP EDGES AROUND TILES
PROBABLE CAUSE
UNDERLYING REASON
TO RECTIFY
Grout being leeched by unbalanced water
Mains water too soft
Regrout the pool. Increase calcium levels to min 250mg/l and maintain. Consider changing sanitiser to calcium-based product (hth) to add calcium and minimise loss of grout
​Ineffective filtration
PROBABLE CAUSE
UNDERLYING REASON
TO RECTIFY
Sand Filter: 
Is the sand level correct?
No - Not enough sand to filter out particles

​Yes - Blocked filter or filtration needs assistance
Renew or top up sand


​Backwash filter and use filter acid
​pH locked in/difficult to adjust
PROBABLE CAUSE
UNDERLYING REASON
TO RECTIFY
Alkalinity too high
Bicarbonate levels in pool too high
Check pH and reduce alkalinity to recommended level
Value
Topping up from mains water can increase alkalinity in hard water areas
Check mains water alkanility level. Is it higher than 150mg/l? 
If so, reduce
Click here to edit.
Carbon dioxide used and increased alkalinity beyond desired level
Aim for pH of 7.6 to minimise Carbon dioxide dosing level
Low alkalinity​
PROBABLE CAUSE
UNDERLYING REASON
TO RECTIFY
Bicarbonates reduced by dilution, particularly in soft water areas
Mains water has too low level of bicarbonates
Add bicarbonate until alkalinity at recommended level
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In case of chemical emergency call the National Chemical Emergency Centre on +44 (0)1235 239 670 or contact your national emergency service