I have a GE Smartwater filter on my refrigerator for drinking water. Will this help my hand over the tap water I have been using to water my 'chids? If so, what catagory does MSU fertilizer fall into as being tap/well water or RO or rainwater? We are in severe drought here is S.W. coastal Florida so no rain water. Also do the Brita filters do anygood. Thanks in advance