THANK YOU for getting that pretty, shiny badge! 
I found your manual! It is a good one! They do step by step for most everything! I would think about printing it out but make sure you have plenty of ink and paper as it is a big one but has some great info. Sand level, pressure testing, etc.
https://pentairpool.com/~/media/websites/pool/downloads/filters/manuals/tagelus_owners_manual_english_french_spanish.pdf
If this does not work as a link you can do a search to find it. (for some reason I have a hard time linking to PDF files
)
It looks like you figured out where the water goes from the filter when you back wash and such. Do you have any idea where it ends up going? Do you have a storm drain or such? Do you have a creek or such close to the yard?
Your pool is not bad at all! I have an idea for you......................adding some DE to the sand. It helps the sand to really filter out the smaller stuff. Here is a link for it:
Pool School - Add DE to a Sand Filter Now the bad part of this is you cannot do it until you will be there to "babysit" the pool. Each filter is so different there is no way to really know how much DE YOUR filter likes. We had one that liked 1/4 cup and another that likes 2.5 cups so.......I say add 1/4 cup to start with. What you are looking for is a slight increase in the filter pressure. If you do not see an increase of at least 1 psi within 30 mins. add another 1/4 cup. Keep doing this 1/4 cup at a time. Now if your pressure SHOOTS up and fast then you need to turn the pump off and do a back wash to get some of the DE out. That is why I say you need to be there to babysit it until you learn what it likes.
Kim

I found your manual! It is a good one! They do step by step for most everything! I would think about printing it out but make sure you have plenty of ink and paper as it is a big one but has some great info. Sand level, pressure testing, etc.
https://pentairpool.com/~/media/websites/pool/downloads/filters/manuals/tagelus_owners_manual_english_french_spanish.pdf
If this does not work as a link you can do a search to find it. (for some reason I have a hard time linking to PDF files
It looks like you figured out where the water goes from the filter when you back wash and such. Do you have any idea where it ends up going? Do you have a storm drain or such? Do you have a creek or such close to the yard?
Your pool is not bad at all! I have an idea for you......................adding some DE to the sand. It helps the sand to really filter out the smaller stuff. Here is a link for it:
Pool School - Add DE to a Sand Filter Now the bad part of this is you cannot do it until you will be there to "babysit" the pool. Each filter is so different there is no way to really know how much DE YOUR filter likes. We had one that liked 1/4 cup and another that likes 2.5 cups so.......I say add 1/4 cup to start with. What you are looking for is a slight increase in the filter pressure. If you do not see an increase of at least 1 psi within 30 mins. add another 1/4 cup. Keep doing this 1/4 cup at a time. Now if your pressure SHOOTS up and fast then you need to turn the pump off and do a back wash to get some of the DE out. That is why I say you need to be there to babysit it until you learn what it likes.
Kim
