NQA
Active Water Treatment

sustainable technology

factory.jpg (3825 bytes)

| AFM homepage | Contact us  | About us |  Shop |
 DrydenAqua homepage  AFM  homepage Calculate how much
AFM for your filter		  STA Training Centre    Pool Performance Factor

.   Pool & water feature Questionnaire  pdf copy

 Physical parameters

Water quality parameters

Questions   your answer Questions   your answer
Geographical location of system   = freshwater yes / no =
swimming pool for the  public yes/no = seawater yes / no =
water feature ( no animals) yes/no = brackish water provide salinity or tds level in mg/l or ppt =
water feature with aquatic animals animal groups/ fish/mammals/invertebrates = borehole water supply yes/no =
=Out door pool yes / no = municipal water supply yes/no =
indoor pool yes / no = water analysis, of influent water provide a potable water analysis and include DPD1, 2 & 3 analysis =
private pool yes / no =      
public pool yes / no = Turbidity ntu =
pool dimensions length m = Langelier index   =
width m = UV at 220 nm transmission. 4cm path length % transmission =
average depth, m = water temp in pool deg C =
pool water volume cubic metres = calcium mg/l =
influent water flow per day cubic metres = alkalinity mg/l =
      redox potential mg/l =
Number of bathers per day average number = DPD 1 free chlorine mg/l =
recirculation or turn over rate cubm/hr = DPD 2 combined chlorine mg/l =
      DPD 3 combined chlorine mg/l =
number of filters No. off = = TDS mg/l  
size of filters diameter metres = chlorine consumption calcium_hyprochlorite kg per week  =
make type of filter   =   sodium_hypochlorite litres per week  =
water flow through filters cubm/hr =   dichlor kg/week  =
air scour yes/no =   trichlor kg/week =
back-wash water flow per filter cubm/hr = pH   =
back-wash frequency times per week = Permanganate value mg/l =
back-wash duration minutes = DOC ( dissolved organic carbon) mg/l =
          =
UV disinfection system installed yes / no       =
Ozone system installed yes / no        

The Table below provides a list of chemical analysis that should be tested when assessing the quality of the water supply (freshwater or seawater) to a swimming pool of Aquatic feature such as a fountain.  If there are animals in the system,  such as fish or cetaceans then contact Dryden Aqua

Water Quality
Parameter              

units

   Comment
 

 

  

Suspended solids

<0.5 mg/l

 fit 1 micron cartridge filters for all influent water

COD

<1 mg/l

 if over 1 mg/l all water should be coagulated, flocculated, ZPM fitted and filtered by AFM at less than 5 m/hr velocity

BOD

<1 mg/l

Grease/oil

Not detect

 if detected you will need to question where on not you should use the water supply for a pool or water feature

Turbidity

<0.5 ntu

 If turbidity is over 0.5 ntu, you will need to use AFM filtration on the influent water supply

pH

6.5 - 8.5

Optimum pH is as close to pH7.0 as possible for chlorinated systems
redox potential 0 - 1000mv  
UV transmission 340 nm 4cm path length, transmission  
UV transmission 254nm 4 cm path length, transmission  
UV transmission 200 nm 4 cm path length, transmission  

Dissolved oxygen

>90% sat

If less than 90% saturation with oxygen it is an indication that the water may be contaminated

Hardness CaCO3

10 - 500

 
Alkalinity as CaCO3 mg/l  

TDS

 

 for chlorinated systems the maximum TDS is usually 1000 mg/l, so it is  best to start with as low a TDS as possible
marine system will be around 35 ppt
DPD1 free chlorine <0.5mg/l  
DPD2 combined chlorine <0.05mg/l  
DPD3 combined chlorine <0.5mg/l  
Bromine / bromate mg/l   
     

cations

   

(positive ions)

   

Aluminium (Al)

0.1 mg/l

Aluminium levels above 0.1mg/l generally means that the filters operated by your water supplier are suffering from
worm-hole channelling recommendation is to use  AFM filtration for all your influent water

Ammonia (NH4)

0.10 mg/l

Many water companies now add ammonium to the water supply to prevent the formation of THM`s. 
If the ammonium levels are above 0.1mg/l try aand minimise the amount of water taken into the system. Water
treatment to remove ammonium may be required

Antimony (Sb)

0.005 mg/l

 

Arsenic (As)

0.01 mg/l

High levels of arsenic are ofen found in borehole or spring water, especially in volcanic regions. Use NoPhos followed
by AFM filtration

Barium (Ba)

 

  

Berillium (Be)

 

  

Boron (B)

1.00 mg/l

 

Cadmium (Cd)

0.005 mg/l

 

Chromium (Cr)

0.05 mg/l

 

Copper (Cu)

0.01 mg/l

 

Iron (Fe)

0.05 mg/l

 Iron must be removed from the system, use AFM filtration on influent water if the iron levels exceed 0.05 mg/l

Lead (Pb)

0.05 mg/l

Manganese (Mn)

0.02 mg/l

 

Mercury (Hg)

0.001 mg/l

 

Nickel (Ni)

0.02 mg/l

 

Selenium (Se)

0.01 mg/l

 

Silver (Ag)

 

  

Sodium (Na)

200 mg/l

 

Tin (Sn) inorganic

 

  

Zinc (Zn)

0.01mg/l

  
     

anions

   

(negative ions)

   

Chloride (Cl)

mg/l or g/l

  

Cyanide (CN)

0.05 mg/l

 

Fluoride (F)

1.5 mg/l

 

Sulfate (SO4)

250 mg/l

 

Nitrate (NO3)

5 mg/l

Nitrate should be as low as possible,  if it is above 5 mg/l  then a DFM  filter may be installed

Nitrite (NO2)

0.05 mg/l

 
Total phosphate as PO4-P 0.01mg/l require a zero phosphate condition
Ortho-Phosphate as PO4-P 0.01 mg/l require a zero phosphate condition
     

microbiological

   

parameters

   
Escherichia coli

0 in 250 ml

 

Enterococci

0 in 250 ml

 

Pseudomonas aeruginosa

0 in 250 ml

 

Clostridium  perfringens

0 in 100 ml

 

Coliform bacteria

0 in 100 ml

 

Colony count 22degC

100/ml

 

Colony count 37degC

20/ml

 
     

other parameters

   

Acrylamide

0.0001 mg/l

 

Benzene (C6H6)

0.001 mg/l

 

Benzo(a)pyrene

0.00001 mg/l

 

1,2-dichloroethane

0.003 mg/l

 

Epichlorohydrin

0.0001 mg/l

 

Pesticides

0.0001 mg/l

 

Pesticides - Total

0.0005 mg/l

 

PAHs

0.0001 mg/l

 

Tetrachloroethene

0.01 mg/l

 

Trichloroethene

0.01 mg/l

 

Trihalomethanes

0.1 mg/l

 

Vinyl chloride

0.0005 mg/l