Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to mix hydroponics nutrients [title] Know what's in your water. [step] Send your water to a lab to be tested, if you can. With good, " soft " water, you'll be able to add any nutrients your plants need for their optimal growing season.

Ending1: Your water should be warmer than the water you've heated. [title] Optimize the water by incorporating added water. Ending2: [substeps] If you don't have access to water, have your water sample collected with a sample taker and water can be mixed quickly and easily. [title] Learn how for hydroponic nutrient boosters. Ending3: With " hard " water, you may need to use reverse osmosis methods to filter out any unwanted heavy metals present in your water. [substeps] You can also use a dissolved solids meter to check your water regularly. Ending4: Plain water is just a mix, while if you choose to grow hydroponic plants, you'll have to try using natural, " freshwater " water. [substeps] Hydroponic plants can adapt to different water levels if you choose to grow them in dry soil and possibly even form a disease.

Answer format: ending1/ending2/ending3/ending4