Many growers with wells use water from a Reverse Osmosis filtering system to water their AVs.  There are no minerals in RO to buffer the acidity of peat based potting mixes. As the potting mix ages, the plant's growing environment becomes very acidic and the plamt may show signs of nutrient "lock up". Symptoms include tight deformed centers, small off- color blossoms or poor growth. You must use fertilizer with micronutrients and add Cal/Mag 1/4 tsp per gallon of water to stabilize pH and allow roots to properly absorb nutrients.