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How do I prevent algae in my bubbleponic water? Can the roots be exposed to lifght if I’m using a translucent vessel? Is the amount of nutrient dependent on liquid measure of water?
Block out the light to prevent algae. The amount of nutrients will indeed depend on how much water you are adding it to. Pick up a cheap EC meter and a nicer ph pen and use those to adjust your feed.
Quote: An electrical conductivity meter (EC meter) measures the electrical conductivity in a solution. It has multiple applications in research and engineering, with common usage in hydroponics, aquaculture, aquaponics, and freshwater systems to monitor the amount of nutrients, salts or impurities in the water.
For our purposes, it's just a tool to measure the salt concentration of a solution. It will also detect other impurities in the water such as calcium. For example, distilled water won't register on my EC meter, but my tap is around 0.2 EC or about 100 ppm on the 500 scale.
For nutrients I use Jacks 321, which ends up being about 15g base nutes, 10g cal nite, and 4g epsom salts per 5 gallons of water. If you're just starting out and measuring nute salts with a scale, you just mix them in in the right order and ratios and makes sure the final EC is in an appropriate range, for me that's around 800 ppm nutes plus the 100 from my tap, so when the meter reads 1.8 EC thats 900 ppm.
Larger growers will pre-dissolve the nutrient salts into concentrated stock solutions, which can be quicker and easier to use similar to bottled nutes, but at a fraction of the cost.
Nutrients will usually lower your pH a bit too, so depending on your tap you might need ph up or ph down. For pH meters I'd go with Apera, they make one with a replaceable probe for around $80-120. Cheaper pH pens are prone to failure, but litmus paper is another option if you can't afford a good pH pen right off the bat.
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