Take the hassel out of chlorinating your pool or spa by using a Pentair chlorine feeder.  Adding large or small slow dissolving chloring tabs or sticks to the canister is done by unscrewing the top and dropping them in.  Afer that, turn the pump on and the water being forced through the chlorinator will start dissovling the tabs or sticks and send the chlorinated water to your pool or spa.  Pentair chlorine feeders feature easy installation on the pressure side of your pump downstream of all other equipment.  They even have a dial control valve so you can adjust the rate at which that tablets or sticks are dissolved to meet your specific pool or spa requirements and with minimal effort on your part.  Ideal for the do-it-yourselfer.