The better the quality of water you use to nurture your plants, the better your results are going to be on every level.
In an ideal scenario, you would have access to only the purest filtered water around, but the reality for most growers (especially indoors) is that you are going to be limited to utilizing tap water. No worries, a majority of growers are successfully using it. There are many filtration products you can buy of various expense and quality if you want to have that extra level of purity going into the whole process.
When using tap water (and in particular, if you are not filtering it), you will want to be extra careful with the initial PH of this water. Most tap water is going to be slightly alkaline to begin with. So it will best if you figure out what its normal PH level is. Simply letting the water sit for a couple of days before you use it on the plants should be more than adequate to lower the chlorine levels, and give you something a little less “hot” to use on nurturing your crop.
Another thing to keep in mind is that tap water already has minerals. Determine what its levels are to begin with (calcium and magnesium), so that you adjust you’re your nutrient feed plan accordingly.
Quality is not the only factor however, and your performance in water management is going to be central to the success of your crop.
HELPFUL WATERING TIPS:
DRAINAGE: Be sure if you are using soil that the plants have good drainage through their containers so that nutrient salts do not build up over time and poison its growth. Never leave plants in standing water
FREQUENCY: This is going to vary according to your strain of plant, stage of growth, pot size and environmental factors like temperature, humidity and ventilation, but in general, your job is to avoid your plants drying out. If you can stick your finger into the top two inches of the medium and it’s dry, then the plant needs to be watered.
OBSERVATION IS KEY: Let the appearance of the plant (stem and leaves) guide you in your frequency of watering. If things start to wilt, then give more water. If you notice drooping, get on the ball.
OPTIMAL WATERING TIME: Whatever your plant’s cycle is (could be different from the actual time of day/daylight conditions outside), it will respond best to watering if done within what it perceives to be its morning “charge up/photo” period.
WATER TEMP: Use water at room temperature to keep the plants comfy and avoid “shocking” them.