Ngaahi meʻa membrane RO mo e NF DuPont FilmTec

Ko e Tuʻunga Fakakautaha ʻi he Tekinolosia Membrane

Ko e ngaahi membrane DuPont FilmTec ʻa e tuʻunga fakamāmānilahi ki he ola ʻo e osimosisi fakafoki mo e nanofiltration. ʻOku ʻoatu ʻe ForeverPure ʻa e ngaahi membrane DuPont FilmTec kakato, mei he ngaahi meʻa angamaheni ki he vai masima mo e vai tahi ʻo aʻu ki he ngaahi laine fakaʻofoʻofa FortiLife mo e Hypershell. Neongo pe ʻokú ke faʻu ha sisitemi foʻou pe fetongi ha meʻa ʻi ha ʻapi ʻoku ʻi ai, ʻe lava ke mau ʻoatu ʻa e meʻa FilmTec totonu ki hoʻo ngāue.

Ko FILMTEC ʻa e fakaʻilonga membrane RO ʻoku falala lahi taha ki ai ʻi māmani, ʻoku ngaohi ʻe he DuPont Water Solutions (ko Dow ʻi muʻa). Ola ʻi he tuʻunga fakakautaha mo e falalaʻanga kuo fakamoʻoniʻi ʻi he ngaahi fokotuʻu ʻe laui miliona ʻi māmani.

Tepile Fili Meʻa FilmTec

Ko e fanga ʻo e ngāue, ko e tafe ʻo e vai hū, mo e taʻofi māsima tuʻumaʻu ki he meʻa FilmTec kotoa ʻoku mau ʻoatu, koeʻuhi ke ke lava ʻo fua ha array mo fakafehoanaki ha ngaahi meʻa ʻo ʻikai fakaava ha pepa fakaikiiki ʻe hongofulu tupu. Ko e ngaahi fika ko e ngaahi fua kuo pulusi ʻe DuPont ʻi honau tuʻunga ʻahiʻahi angamaheni — ʻoku fakatatau ʻa e ola moʻoni ki hoʻo vai fakahū, ʻa e māfana, ʻa e mafatukituki, mo e fakaakeake, ko ia fakapapauʻi ʻaki ha lau ki muʻa pea ke toki fakaikiiki. ʻOku fehokotaki ʻa e meʻa taki taha mo hono pepa fakaikiiki kakato mo hono totongi lolotonga ʻi he ForeverPure Place.

Ngaahi Meʻa RO Vai Tahi (SWRO)

Ngaahi meʻa vai tahi 8 ʻinisi ki he ngaahi laine SWRO 600-1,200 psi. Ko e taʻofi māʻolunga ange ʻoku totongi ʻaki ʻa e tafe; ko e tafe lahi ange ʻoku totongi ʻaki ʻa e taʻofi. Fili mei he lau, ʻo ʻikai mei he fika ʻoku hā mai.

MeʻaFanga ʻo e ngāueTafe ʻo e vai hūTaʻofi māsima
SW30HRLE-370-34i370 ft² (34 m²)7,200 GPD (27.3 m³/d)99.8%
SW30HRLE-370/34-WET370 ft² (34 m²)7,500 GPD (28.4 m³/d)99.80%
SW30HRLE-400400 ft² (37 m²)7,500 GPD (28.4 m³/d)99.8%
SW30XHR-400i400 ft² (37 m²)6,000 GPD (22.7 m³/d)99.82%
SW30XHR-440i440 ft² (41 m²)6,600 GPD (25.0 m³/d)99.82%
SW30XFR-400/34-DRY400 ft² (37 m²)7,200 GPD (27.3 m³/d)99.80%
SW30XFR-400/34I-DRY400 ft² (37 m²)7,200 GPD (27.3 m³/d)99.80%
SW30XFR-400/34I-WET400 ft² (37 m²)7,200 GPD (27.3 m³/d)99.80%
SW30XLE-400-WET400 ft² (37 m²)8,500 GPD (32.2 m³/d)99.75%
SW30XLE-400/34-ELEMENT-DRY400 ft² (37 m²)8,500 GPD (32.2 m³/d)99.75%
SW30XLE-440i440 ft² (41 m²)8,800 GPD (33.3 m³/d)99.7%
SW30HR-380380 ft² (35 m²)6,000 GPD (22.7 m³/d)99.75%
SEAMAXX-440440 ft² (41 m²)13,200 GPD (50 m³/d)99.70%
SWBR-100I370 ft² (34 m²)vakai ki he pepa fakaikiiki DuPont ʻoku ngāue
SWBR-150I370 ft² (34 m²)vakai ki he pepa fakaikiiki DuPont ʻoku ngāue
SWBR-200370 ft² (34 m²)vakai ki he pepa fakaikiiki DuPont ʻoku ngāue

Fakatokanga ki he sīsia SWBR: ʻoku kehekehe ʻa e ngaahi fika tafe vai hū kuo pulusi ki he ngaahi meʻa fakafefeka vai māsima tahi fakatatau ki he tuʻunga ʻahiʻahi (600 psi pe 800 psi), pea naʻe ʻikai lava ke mau fakapapauʻi ha fika pē ʻe taha ki he pepa fakaikiiki DuPont ʻoku ngāue, ko ia kuo mau toʻo atu ʻemau fika kae ʻikai ke mau pulusi ha fika te ke fakaikiiki ʻaki. Ko e fanga ngāue 370 ft² (34 m²) kuo fakapapauʻi. Fetuʻutaki mai pea te mau ʻoatu ʻa e pepa fakaikiiki ʻoku ngāue.

Ngaahi Meʻa RO Vai Masima (BWRO)

Ngaahi meʻa vai masima 8 ʻinisi ki he ngāue 150-600 psi. Ko e sīsia PRO ʻa e toʻutangata lolotonga; ʻoku foaki ʻe he XHR ʻa e tafe ke maʻu ʻa e taʻofi māʻolunga taha ʻi he fāmili.

MeʻaFanga ʻo e ngāueTafe ʻo e vai hūTaʻofi māsima
BW30XHR-PRO-400/34400 ft² (37 m²)9,500 GPD (36.0 m³/d)99.8%
BW30XHR-PRO-400/34I400 ft² (37 m²)9,500 GPD (36.0 m³/d)99.8%
BW30XHR-PRO-440440 ft² (41 m²)10,500 GPD (39.7 m³/d)99.8%
BW30-PRO-365365 ft² (34 m²)10,200 GPD (38.6 m³/d)99.7%
BW30-PRO-400400 ft² (37 m²)10,500 GPD (39.7 m³/d)99.7%
BW30-PRO-400/34400 ft² (37 m²)10,500 GPD (39.7 m³/d)99.7%
BW30-PRO-400/34I400 ft² (37 m²)10,500 GPD (39.7 m³/d)99.7%
BW30-PRO-404085 ft² (7.9 m²)2,400 GPD (9.1 m³/d)99.7%
BW30HR-440i440 ft² (41 m²)10,200 GPD (38.6 m³/d)99.7%
BW30HRLE-440440 ft² (41 m²)11,500 GPD (43.5 m³/d)99.5%
BW30XFRLE-400/34400 ft² (37 m²)11,500 GPD (43.5 m³/d)99.7%
BW30XFRLE-400/34I400 ft² (37 m²)11,500 GPD (43.5 m³/d)99.7%
XLE-440440 ft² (41 m²)11,500 GPD (43.5 m³/d)99.0%

Malohi Siʻi mo Taʻofi ʻa e ʻUli

Ngaahi meʻa kuo faʻu ki he mafatukituki ngāue māʻulalo pe ki he vai ʻoku ne ʻuliʻi ʻa e membrane angamaheni — Fortilife ki he fakaakeake māʻolunga mo e vai faingataʻa, Eco ki he malohi.

MeʻaFanga ʻo e ngāueTafe ʻo e vai hūTaʻofi māsima
ECO-PLATINUM-440I440 ft² (41 m²)12,600 GPD (47.7 m³/d)99.7%
ECO-PRO-400I400 ft² (37 m²)11,500 GPD (43.5 m³/d)99.7%
ECO-PRO-440440 ft² (41 m²)12,000 GPD (45.4 m³/d)99.7%
ECO-PRO-440I440 ft² (41 m²)12,000 GPD (45.4 m³/d)99.7%
FORTILIFE-XC120-ELEMENT400 ft² (37 m²)5,000 GPD (18.9 m³/d)99.0%
FORTILIFE-XC120UHP-ELEMENT400 ft² (37 m²)5,000 GPD (18.9 m³/d)99.0%
FORTILIFE-XC160UHP-ELEMENT400 ft² (37 m²)5,800 GPD (22.0 m³/d)98.5%
FORTILIFE-XC70-ELEMENT400 ft² (37 m²)3,800 GPD (14.4 m³/d)99.5%
FORTILIFE-XC80-ELEMENT400 ft² (37 m²)4,200 GPD (15.9 m³/d)99.3%
FORTILIFE-CR100-ELEMENT400 ft² (37 m²)4,000 GPD (15.1 m³/d)99.2%
FORTILIFE-CR100I-ELEMENT400 ft² (37 m²)4,000 GPD (15.1 m³/d)99.2%
FORTILIFE-CR200-ELEMENT400 ft² (37 m²)5,500 GPD (20.8 m³/d)99.0%
FORTILIFE-CR50-ELEMENT400 ft² (37 m²)3,200 GPD (12.1 m³/d)99.5%
LINE-XD400 ft² (37 m²)13,000 GPD (49.2 m³/d)99.5%
LINE-XD-HP400 ft² (37 m²)11,000 GPD (41.6 m³/d)99.7%

Nanofiltration

Taʻofi fakakonga ki he fakamolū, toʻo ʻo e lanu mo e meʻa moʻui, mo e pule ʻo e sulfate, ʻi ha mafatukituki māʻulalo ange ʻi he RO.

MeʻaFanga ʻo e ngāueTafe ʻo e vai hūTaʻofi māsima
NF270-254028 ft² (3 m²)900 GPD (3.4 m³/d)99.2 (MgSO4)%
NF270-400-34i400 ft² (37 m²)13,200 GPD (50.0 m³/d)99.2 (MgSO4)%
NF270-404082 ft² (8 m²)2,700 GPD (10.2 m³/d)99.2 (MgSO4)%
NF270-440440 ft² (41 m²)15,800 GPD (59.8 m³/d)> 97% MgSO4
NF90-400-34i400 ft² (37 m²)9,500 GPD (36.0 m³/d)97.0 (NaCl) / 99.5 (MgSO4)%
NF90-404082 ft² (8 m²)2,100 GPD (7.9 m³/d)97.0 (NaCl) / 99.5 (MgSO4)%
NF245-3838-30-FF70 ft² (7 m²)2,200 GPD (8.3 m³/d)99.0 (MgSO4)%
NF245-3840-30-FF75 ft² (7 m²)2,350 GPD (8.9 m³/d)99.0 (MgSO4)%
NF-3838/30-FF300 ft² (28 m²)9,500 GPD (36.0 m³/d)> 97% MgSO4
NF-3840/30-FF350 ft² (33 m²)11,000 GPD (41.6 m³/d)> 97% MgSO4
FORTILIFE-NF1000-ELEMENT400 ft² (37 m²)6,000 GPD (22.7 m³/d)> 95% MgSO4
FORTILIFE-NF1000-HP-ELEMENT400 ft² (37 m²)6,000 GPD (22.7 m³/d)> 95% MgSO4

Makehe, Maʻa ʻAupito mo Fakamaʻa

Ngaahi meʻa tuʻunga semiconductor, fakamaʻa full-fit, māfana māʻolunga, mo e toʻo sulfate, ki he ngaahi ngāue ʻe ʻikai lava ʻe ha meʻa fakaʻindasitulia angamaheni.

MeʻaFanga ʻo e ngāueTafe ʻo e vai hūTaʻofi māsima
SG30-400/34I400 ft² (37 m²)8,000 GPD (30.3 m³/d)99.7%
SG30LE-440i440 ft² (41 m²)7,500 GPD (28.4 m³/d)99.8%
SG30LE-PRO-440440 ft² (41 m²)12,500 GPD (47.3 m³/d)99.7%
HSRO-390-FF390 ft² (36 m²)9,200 GPD (34.8 m³/d)99.5%
HSRO-4040-FF85 ft² (8 m²)2,200 GPD (8.3 m³/d)99.5%
HSRO-4118-FF152 ft² (14 m²)3,500 GPD (13.2 m³/d)99.7%
HYPERSHELL-HSRO-390390 ft² (36 m²)8,500 GPD (32.2 m³/d)99.7%
HYPERSHELL-NF245N-8038/48-FF-AND-NF245N-3838/48-FF-NANOFILTRATION-ELEMENTS480 ft² (45 m²)13,800 GPD (52.2 m³/d)> 95% MgSO4
HYPERSHELL-NF245XD380 ft² (35 m²)11,000 GPD (41.6 m³/d)> 95% MgSO4
HYPERSHELL-NF245XD-3838/48420 ft² (39 m²)12,000 GPD (45.4 m³/d)> 95% MgSO4
HYPERSHELL-NF245XD-8038380 ft² (35 m²)11,000 GPD (41.6 m³/d)> 95% MgSO4
HYPERSHELL-NF245XD-8038/48480 ft² (45 m²)13,800 GPD (52.2 m³/d)> 95% MgSO4
HYPERSHELL-RO-390390 ft² (36 m²)8,500 GPD (32.2 m³/d)99.7%
RO-3838-30-FF70 ft² (7 m²)1,800 GPD (6.8 m³/d)99.5%
RO-390-FF390 ft² (36 m²)9,200 GPD (34.8 m³/d)99.5%
RO-4040-FF85 ft² (8 m²)2,200 GPD (8.3 m³/d)99.5%
SR90400 ft² (37 m²)12,000 GPD (45.4 m³/d)99.0 (MgSO4)%
SPECIALTY-MEMBRANES-HTNF-4040/34-AND-HTNF-8040/34-HIGH-TEMPERATURE-NANOFILTRATION-ELEMENTS85 / 400 ft²2,500 / 10,000 GPD> 95% MgSO4

Ngaahi Meʻa Fakakonga Siʻi 2.5 mo e 4 ʻInisi

Ngaahi meʻa fuositoʻo siʻi ki he skid, meʻa ngaohi vai, ngaahi meʻa ʻi he feituʻu ngāueʻaki, mo e ngaahi meʻa ʻahiʻahi.

MeʻaFanga ʻo e ngāueTafe ʻo e vai hūTaʻofi māsima
TW30-1812-1008 ft² (1 m²)100 GPD (0.4 m³/d)98.0%
TW30-1812-100HR8 ft² (1 m²)90 GPD (0.3 m³/d)99.0%
TW30-1812-504 ft² (0 m²)50 GPD (0.2 m³/d)98.0%
TW30-251417 ft² (2 m²)250 GPD (0.9 m³/d)98.0%
TW30-401430 ft² (3 m²)500 GPD (1.9 m³/d)98.0%
TW30-402146 ft² (4 m²)750 GPD (2.8 m³/d)98.0%
TW30-PRO-404085 ft² (7.9 m²)2,400 GPD (9.1 m³/d)99.5%
TW30HP-461198 ft² (9 m²)1,100 GPD (4.2 m³/d)99.0%
TW30HP-4619156 ft² (14 m²)1,800 GPD (6.8 m³/d)99.0%
BW60-1812-758 ft² (0.8 m²)75 GPD (0.28 m³/d)98%
AQUALAST-1812-HR8 ft² (0.8 m²)50 GPD (0.19 m³/d)98%
SW30-251417 ft² (2 m²)300 GPD (1.1 m³/d)99.4%
SW30-252124 ft² (2 m²)400 GPD (1.5 m³/d)99.4%
SW30-254028 ft² (3 m²)500 GPD (1.9 m³/d)99.4%
XLE-PRO-404085 ft² (7.9 m²)2,600 GPD (9.8 m³/d)99.0%

Fie maʻu tokoni ke fili? Ko ʻemau tataki faʻu SWRO ʻoku ne ʻufiʻufi ʻa e fokotuʻutuʻu ʻo e array mo e taumuʻa flux, ngaahi fua tuʻunga vai ʻoku ne fakamatalaʻi ʻa e sivi vai fakahū ʻoku fie maʻu ʻe ha lau, pea ko e fakamahu kemikale ʻoku ne ʻufiʻufi ʻa e meʻa taʻofi ʻumea ʻoku ne tauhi ke maʻa ʻa e ngaahi meʻa ni. Pe ʻoatu mai hoʻo sivi vai pea te mau fakahoko ʻa e lau.

Ngaahi Meʻa Filmtec ʻoku ʻi ai ʻi ForeverPurePlace

Ko e ngaahi meʻa Filmtec ʻi lalo ʻoku ʻi ai ʻi he fale koloa pea ʻoku ʻoatu hangatonu mei he ForeverPurePlace. Lomiʻi ha meʻa ke vakai ki he totongi lolotonga pea fai ha fakatau.

RO Vai Tahi

Vai Masima / Malohi Siʻi

Fortilife Lelei ʻAupito

Ngaahi Membrane RO Vai Masima

Ngaahi meʻa taʻofi māʻolunga mo e ola lahi ki he fakamāsima vai masima fakakolo mo fakaʻindasitulia. Mafatukituki ngāue angamaheni 150–300 psi.

Sīsia Eco

Ngaahi meʻa lelei ʻaupito ʻoku fakatatau ʻa e taʻofi māʻolunga, ʻa e tafe lahi, mo e ngāue ʻaki siʻi ʻo e malohi, ki ha ngāue vai masima kuo fakalelei ki he totongi.

Ngaahi Membrane RO Vai Tahi

Ngaahi meʻa mafatukituki māʻolunga mo e taʻofi māʻolunga ki he fakamāsima vai tahi hū tuʻo taha. Mafatukituki ngāue ʻo aʻu ki he 1,200 psi (83 bar).

Ngaahi Membrane Nanofiltration

Ngaahi membrane vahevahe fili ki hono toʻo ʻo e fefeka mo e lanu, fakasiʻisiʻi fakakonga ʻo e minelale, mo e fakasiʻisiʻi ʻo e meʻa moʻui, ʻi ha mafatukituki ngāue māʻulalo ange ʻi he RO.

Ngaahi Membrane RO Vai Paipa

Ngaahi meʻa mafatukituki māʻulalo kuo fakalelei ki hono fakamaʻa ʻo e vai paipa fakakolo ʻi he ngāue fakapisinisi mo e fakaʻindasitulia maʻamaʻa.

Ngaahi Membrane ki he Meʻakai mo e Inu

Ngaahi meʻa fakamaʻa full-fit (FF) kuo faʻu ke ala hangatonu ki he vai ngāue ʻo e meʻakai mo e inu. Ngaahi meʻa ʻoku fenāpasi mo e FDA.

Sīsia FortiLife

Ngaahi membrane fakaʻofoʻofa mo e ola lahi ki he vahevahe ʻi he ngāue fakaʻindasitulia, ngaahi ngāue fakaakeake māʻolunga, mo e vai fakahū faingataʻa. Moʻui lōloa ange ʻa e meʻa ʻi he tuʻunga faingataʻa.

Sīsia Hypershell

Ngaahi meʻa fuositoʻo lahi mo e tafe lahi ʻi ha ipu kuo fakamālohia ʻaki ʻa e fiberglass, ki he ngaahi ngāue fakaʻindasitulia mo e vahevahe makehe.

Fakaakeake Vai Māsima Tahi SWBR

Ngaahi meʻa fakafefeka vai māsima tahi ʻoku nau ʻave ʻa e vai māsima liʻaki ʻo e SWRO ki ha māsima māʻolunga ange, ko ia ʻoku toe maʻu ai ʻe he ʻapi ha vai hū lahi ange mei he vai tatau ʻoku toʻo mai.

Ko e ngaahi meʻa ni ʻikai ko ha meʻa fakamolū vai masima. Ki he nanofiltration vai masima mo e toʻo fili ʻo e ion ua-tuʻunga, vakai ki he meʻa NF90 mo e NF270 ʻi ʻolunga.

Ngaahi Fehuʻi ʻoku Faʻa ʻEke

Ko e hā ʻa e ngaahi membrane FilmTec ʻoku ʻoatu ʻe he ForeverPure?

ʻOku mau ʻoatu ʻa e ngaahi meʻa DuPont FilmTec kakato — BW30 PRO vai masima, SW30 vai tahi, nanofiltration NF90/NF270, Fortilife, mo e meʻa Eco — ki he RO vai tahi, vai masima, vai paipa, mo e meʻakai mo e inu.

Ko e ngaahi meʻa DuPont FilmTec moʻoni ʻeni?

ʻIo. ʻOku ʻoatu ʻe he ForeverPure ʻa e ngaahi membrane DuPont FilmTec moʻoni, ʻe lava ke fakatau ʻi he foreverpureplace.com.

Ko e fē membrane FilmTec ʻoku totonu ki heʻeku ngāue?

ʻOku fakatatau ia ki hoʻo vai fakahū (vai tahi, vai masima, pe vai paipa), ki he taʻofi ʻokú ke taumuʻa ki ai, mo e fakaakeake. Vahevahe mai hoʻo sivi vai pea te mau fokotuʻu ʻa e meʻa totonu pe faʻu ha sisitemi kakato.

Ko e hā ʻa e FilmTec SWBR-200?

Ko e FilmTec SWBR-200 ko ha meʻa fakafefeka vai māsima tahi — ʻoku fakamatalaʻi ʻe DuPont ia ko ha meʻa ʻoku ne fakamaʻa mo fakafefeka ʻa e vai māsima sodium chloride mei he ngaahi ʻapi fakamāsima SWRO, ʻi he mafatukituki fakahū vai tahi angamaheni ʻi lalo ʻi he 1,200 psig (83 bar). ʻOku ʻi ai hono fanga ngāue 370 ft² (34 m²). ʻOku kehekehe ʻa e ngaahi fika tafe vai hū kuo pulusi ki he fāmili ni fakatatau ki hono lau ʻi he tuʻunga ʻahiʻahi 600 psi pe 800 psi, ko ia kole mai ʻa e pepa fakaikiiki DuPont ʻoku ngāue ki muʻa pea ke toki fakaikiiki ha tafe — ʻoku mau saiʻia ange ke ʻoatu ʻa e pepa ʻa e kautaha ngaohi ʻi hoʻo fua ha array ʻaki ha fika ʻoku ʻikai lava ke mau fakapapauʻi.

Ko e hā ʻa e ngāue ʻa ha meʻa toe maʻu vai māsima tahi (SWBR)?

Kuo faʻu ʻa e ngaahi meʻa SWBR ki he ngāue māsima lahi mo e mafatukituki māʻolunga ʻo ha array hū tuʻo ua pe ko ha sitepu vai māsima, ʻa ia ko e vai fakahū kuo ʻosi fakafefeka mei he liʻaki ʻa e SWRO kae ʻikai ko e vai tahi taʻe-ngāueʻi. ʻOku nau faingofuaʻi ʻa e ʻapi ke hiki hake ʻa e fakaakeake fakakātoa ʻo laka hake ʻi he meʻa ʻe lava ʻe he hū vai tahi tuʻo taha, ʻa ia ʻoku mahuʻinga ʻi he taimi ʻoku fakangatangata ai ʻa e lahi ʻo e vai ʻoku toʻo mai pe ko e vai māsima ʻoku liʻaki.

Ko e hā ʻa e faikehekehe ʻi he vahaʻa ʻo e SW30HRLE, SW30XLE mo e SW30XHR?

ʻOku nau tuʻu ʻi ha ngaahi tuʻunga kehekehe ʻi he fetongitongi tatau ʻi he vahaʻa ʻo e tafe mo e taʻofi. Ko e SW30XHR-400i ʻa e fili taʻofi māʻolunga ʻi he 99.82% mo e 6,000 GPD; ʻoku fakatatau ʻe he SW30HRLE-400 ʻi he 99.8% mo e 7,500 GPD; ko e SW30XLE-400 ʻa e fili malohi siʻi mo e tafe lahi ʻi he 99.75% mo e 8,500 GPD. Ko e tafe lahi ange ʻi he meʻa taki taha ʻoku ʻuhinga ia ki ha meʻa siʻi ange pe ha mafatukituki māʻulalo ange, kae mole ai ha kihiʻi tuʻunga ʻo e vai hū — ko e fē ʻo ia ʻoku mahuʻinga ʻoku fakapapauʻi ia ʻe hoʻo taumuʻa TDS pe boron ʻi he vai hū, ʻo ʻikai ʻe he fika ʻoku hā mai.

Fakatau ha Membrane FilmTec

Fetuʻutaki ki he ForeverPure ki he tokoni ʻi he fili ʻo e meʻa membrane, tokoni ʻi he faʻu ʻo e sisitemi, mo e totongi fefeʻauʻaki — pe fakatau mei heʻemau katalongi ʻi he ʻinitaneti ke maʻu vave.

Kole ha Fakatau Fakatau ʻi he ʻInitaneti