You have mustard algae. Have your local pool store test for phosphates. I can almost guarantee you have them. This makes you a candidate for mustard algae. You should try a product that removes phosphates. LoChlor's Algaecide and Starver Treatment is the best.

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 3 words with the pattern -TA-V--. That is, seven letter words with 2nd letter T and 3rd letter A and 5th letter V. In alphabetical order, they are:

starved

starver

starves

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern S-A-V-R. That is, seven letter words with 1st letter S and 3rd letter A and 5th letter V and 7th letter R. In alphabetical order, they are:

starver

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 9 words with the pattern --ARV--. That is, seven letter words with 3rd letter A and 4th letter R and 5th letter V. In alphabetical order, they are:

charver

dwarves

scarves

starved

starver

starves

swarved

swarves

wharves

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 5 words with the pattern -T--V-R. That is, seven letter words with 2nd letter T and 5th letter V and 7th letter R. In alphabetical order, they are:

starver

steever

stiever

striver

stuiver