bob - Dave is correct about Aquashade reducing phytoplankton but phytoplankton does still grow in the upper waters of the pond. When using the perscribed label dosage, the plant growth (algae and weeds) is limited to the upper 2 to 3 ft of water. When using Aquashade, generally the darker (bluer) you make the water the more light that gets filtered out and the less plant growth that is produced. Very light doses of Aquashade do proportionally less to suppress plant growth.
PS Bob you will combat algae as long as you own your pond. If algae is not growing in your pond you have major problems. It is just when algae are growing at nuisance proportions is when it is perceived as problematic.
