Can Aquatabs be used to clean swimming pool water? Can Aquatabs be used to prepare/chlorinate water for swimming?  They are used  to clean water for drinking so is it safe to assume that if used in proper quantity they can also clean water for swimming?

We are currently at a place where there is no pool and the temperatures are soaring, our 3 year old son has a small pool which we take along on picnics.  I was not able to find pool chlorine somewhere over here but we do have adequate quantity of aquatabs with us.

I tested this and the water smelled/tasted just like it does in a properly chlorinated pool but want to be sure if they are adequate. 

Just in case, the label says


  Each tablet contains 500mg Sodium Dichloroisocyanurate (300mg Free available 
  chlorine)


I am not really worried about maintaining a pH level over the matter of days, its more of a one time thing then we can change water.
Aquatabs can certainly be used as a disinfectant in a small swimming pool like you've described. The active ingredient has many uses, including drinking water treatment as you've pointed out, but it is also used as a disinfectant in swimming pools.  

According to this Wikipedia article regarding the active ingredient of Aquatabs, sodium dichloroisocyanurate:  


  As a disinfectant, it is used to sterilize drinking water, swimming pools, tableware and air, fight against infectious diseases as routine disinfection.  


A study was done[1] comparing the effectiveness of sodium hypochlorite (common household bleach, also used for pool chlorination) with sodium dichloroisocyanurate. From the abstract:  


  A comparison of commercial sodium hypochlorite (NaOCl) and sodium dichloroisocyanurate (NaDCC) products was made. Solutions of NaOCl and NaDCC containing the same levels of available chlorine (av.Cl) exhibited very similar bactericidal activities, despite significant differences in pH.  


The ideal level of active chlorine for a swimming pool at neutral pH is about 0.5 to 1.5 mg of active chlorine per liter of pool water. So, if you aim for the middle of this range, you would want to add one Aquatab tablet for every 300 liters of water in your pool. Also, note that chlorine is less than half as effective at a pH of 8 as it is at a pH of 7, so I would pay some attention to the pH anyway.


D. Coates, J. Hosp. Infect. 1985, 6 (1),31-40. A comparison of sodium hypochlorite and sodium dichloroisocyanurate products. DOI: 10.1016/S0195-6701(85)80015-3